FlutterでFirebaseを連携してiosで実行したい

前提・実現したいこと

FlutterでFirebaseを連携してiosで実行したいのですが、
エラーを吐いてしまいうまくいきません。

以下のサイトを参考にしてます。
参考
Firebaseにプロジェクトを作成して、バンドル IDを追加して
GoogleService-Info.plistをRunner/Runnerに格納して
pubspec.yamlに必要事項を追加したのですが、実行するとエラーになります。

ご教授お願い致します。

発生している問題・エラーメッセージ

Error output from Xcode build:
↳
    2020-05-02 01:06:54.357 xcodebuild[37114:14830530]  DTDeviceKit: deviceType from 1b505360927b73b006abf749ee33c17fe0229f3d was NULL
    ** BUILD FAILED **


Xcode's output:
↳
    /Users/tetetete/flutter/.pub-cache/hosted/pub.dartlang.org/google_sign_in-3.3.0+1/ios/Classes/GoogleSignInPlugin.m:138:41: warning: 'UIApplicationOpenURLOptionsSourceApplicationKey' is only available on iOS 9.0 or newer [-Wunguarded-availability]
      NSString *sourceApplication = options[UIApplicationOpenURLOptionsSourceApplicationKey];
                                            ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    In module 'UIKit' imported from /Users/tetetete/my_app/ios/Pods/Target Support Files/google_sign_in/google_sign_in-prefix.pch:2:
    /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator13.2.sdk/System/Library/Frameworks/UIKit.framework/Headers/UIApplication.h:518:51: note: 'UIApplicationOpenURLOptionsSourceApplicationKey' has been marked as being introduced in iOS 9.0 here, but the deployment target is iOS 8.0.0
    UIKIT_EXTERN UIApplicationOpenURLOptionsKey const UIApplicationOpenURLOptionsSourceApplicationKey NS_SWIFT_NAME(sourceApplication) API_AVAILABLE(ios(9.0));   // value is an NSString containing the bundle ID of the originating application; non-nil if the originating application and this application share the same team identifier
                                                      ^
    /Users/tetetete/flutter/.pub-cache/hosted/pub.dartlang.org/google_sign_in-3.3.0+1/ios/Classes/GoogleSignInPlugin.m:138:41: note: enclose 'UIApplicationOpenURLOptionsSourceApplicationKey' in an @available check to silence this warning
      NSString *sourceApplication = options[UIApplicationOpenURLOptionsSourceApplicationKey];
                                            ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    /Users/tetetete/flutter/.pub-cache/hosted/pub.dartlang.org/google_sign_in-3.3.0+1/ios/Classes/GoogleSignInPlugin.m:139:27: warning: 'UIApplicationOpenURLOptionsAnnotationKey' is only available on iOS 9.0 or newer [-Wunguarded-availability]
      id annotation = options[UIApplicationOpenURLOptionsAnnotationKey];
                              ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    In module 'UIKit' imported from /Users/tetetete/my_app/ios/Pods/Target Support Files/google_sign_in/google_sign_in-prefix.pch:2:
    /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator13.2.sdk/System/Library/Frameworks/UIKit.framework/Headers/UIApplication.h:519:51: note: 'UIApplicationOpenURLOptionsAnnotationKey' has been marked as being introduced in iOS 9.0 here, but the deployment target is iOS 8.0.0
    UIKIT_EXTERN UIApplicationOpenURLOptionsKey const UIApplicationOpenURLOptionsAnnotationKey NS_SWIFT_NAME(annotation) API_AVAILABLE(ios(9.0));   // value is a property-list typed object corresponding to what the originating application passed in UIDocumentInteractionController's annotation property
                                                      ^
    /Users/tetetete/flutter/.pub-cache/hosted/pub.dartlang.org/google_sign_in-3.3.0+1/ios/Classes/GoogleSignInPlugin.m:139:27: note: enclose 'UIApplicationOpenURLOptionsAnnotationKey' in an @available check to silence this warning
      id annotation = options[UIApplicationOpenURLOptionsAnnotationKey];
                              ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    2 warnings generated.
    /Users/tetetete/flutter/.pub-cache/hosted/pub.dartlang.org/firebase_core-0.2.5+1/ios/Classes/FirebaseCorePlugin.m:13:17: warning: property 'dictionary' requires method 'dictionary' to be defined - use @dynamic or provide a method implementation in this category [-Wobjc-property-implementation]
    @implementation FIROptions (FLTFirebaseCorePlugin)
                    ^
                                 ^
 ~~~~~~~~~~~~省略~~~~~~~~~~~~
                                                                   ^
    /Users/tetetete/flutter/.pub-cache/hosted/pub.dartlang.org/firebase_auth-0.6.6/ios/Classes/FirebaseAuthPlugin.m:235:67: error: incompatible block pointer types sending 'void (^)(FIRUser *__strong, NSError *__strong)' to parameter of type 'FIRAuthDataResultCallback _Nullable' (aka 'void (^)(FIRAuthDataResult * _Nullable __strong, NSError * _Nullable __strong)')
                                                           completion:^(FIRUser *user, NSError *error) {
                                        
                                                            ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
                                                                     ^
    /Users/tetetete/flutter/.pub-cache/hosted/pub.dartlang.org/firebase_auth-0.6.6/ios/Classes/FirebaseAuthPlugin.m:392:62: warning: implicit conversion loses integer precision: 'long' to 'int' [-Wshorten-64-to-32]
      userData[@"lastSignInTimestamp"] = [NSNumber numberWithInt:lastSignInDate];
                                         ~                       ^~~~~~~~~~~~~~
    2 warnings and 15 errors generated.
    note: Using new build system
    note: Planning build
    note: Constructing build description

Could not build the application for the simulator.
Error launching application on iPhone 11 Pro Max.

該当のソースコード

android/build.gradleに追記

dependencies {
        classpath 'com.google.gms:google-services:3.2.1'
        classpath 'com.android.tools.build:gradle:3.5.0'
        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
    }

pubspec.yamlに追記

dependencies:
  flutter:
    sdk: flutter
  firebase_core: ^0.2.5  # add dependency for Firebase Core
  firebase_auth: ^0.6.6
  google_sign_in: ^3.2.4

Dart
1import 'package:firebase_auth/firebase_auth.dart';
2import 'package:flutter/material.dart';
3import 'package:google_sign_in/google_sign_in.dart';
4
5void main() => runApp(MyApp());
6
7class MyApp extends StatelessWidget {
8  @override
9  Widget build(BuildContext context) {
10    return MaterialApp(
11      title: 'Flutter × firebase Demo',
12      theme: ThemeData(
13        primarySwatch: Colors.blue,
14      ),
15      home: MyHomePage(title: 'Flutter × firebase Demor'),
16    );
17  }
18}
19
20class MyHomePage extends StatefulWidget {
21  MyHomePage({Key key, this.title}) : super(key: key);
22
23  final String title;
24
25  @override
26  _MyHomePageState createState() => _MyHomePageState();
27}
28
29class _MyHomePageState extends State<MyHomePage> {
30  FirebaseUser _user;
31
32  void _setUser(FirebaseUser user) {
33    setState(() {
34      _user = user;
35    });
36  }
37
38  final GoogleSignIn _googleSignIn = GoogleSignIn();
39  final FirebaseAuth _auth = FirebaseAuth.instance;
40
41  Future<FirebaseUser> _handleSignIn() async {
42    GoogleSignInAccount googleUser = await _googleSignIn.signIn();
43    GoogleSignInAuthentication googleAuth = await googleUser.authentication;
44    FirebaseUser user = await _auth.signInWithGoogle(
45      accessToken: googleAuth.accessToken,
46      idToken: googleAuth.idToken,
47    );
48    print("signed in " + user.displayName);
49    return user;
50  }
51
52  @override
53  Widget build(BuildContext context) {
54    return Scaffold(
55        appBar: AppBar(
56          title: Text(widget.title),
57        ),
58        body: _user == null ? googleAuthBtn() : chat());
59  }
60
61  Widget googleAuthBtn() {
62    return Center(
63      child: Column(
64        mainAxisAlignment: MainAxisAlignment.center,
65        children: <Widget>[
66          FlatButton(
67            padding: EdgeInsets.all(20.0),
68            color: Colors.grey,
69            onPressed: () {
70              _handleSignIn()
71                  .then((FirebaseUser user) => _setUser(user))
72                  .catchError((e) => print(e));
73            },
74            child: Text('google認証'),
75          ),
76        ],
77      ),
78    );
79  }
80
81  Widget chat() {
82    return Center(
83      child: Column(
84        mainAxisAlignment: MainAxisAlignment.center,
85        children: <Widget>[Text('chat')],
86      ),
87    );
88  }
89}
90