herokuでデプロイ(push)することができません。

前提・実現したいこと

discord.js(12.5.0)で作成したBotをherokuを利用して稼働させるため、pushしたところ、リジェクトされてしましまた。
macOS(BigSur)にて作業しています。
参考にさせていただいた記事

発生している問題・エラーメッセージ

コンソロールにて

> git add .
> git commit -m "make it is"

を実行して変更をコミットし、

git push

でデプロイしようとしました。
この時アプリケーションフォルダの階層に移動していて、herokuにはログインしています。

Enumerating objects: 406, done.
Counting objects: 100% (406/406), done.
Delta compression using up to 4 threads
Compressing objects: 100% (398/398), done.
Writing objects: 100% (406/406), 778.34 KiB | 3.80 MiB/s, done.
Total 406 (delta 49), reused 0 (delta 0)
remote: Compressing source files... done.
remote: Building source:
remote: 
remote:  !     error fetching custom buildpack https://buildpack-registry.s3.amazonaws.com/buildpacks/heroku/node.js.tgz
remote: 
remote:  !     Push failed
remote:  !
remote:  ! ## Warning - The same version of this code has already been built: 12a3ee57125740db1a8c513f6e060c3980c2d737
remote:  !
remote:  ! We have detected that you have triggered a build from source code with version 12a3ee57125740db1a8c513f6e060c3980c2d737
remote:  ! at least twice. One common cause of this behavior is attempting to deploy code from a different branch.
remote:  !
remote:  ! If you are developing on a branch and deploying via git you must run
remote:  !
remote:  !     git push heroku <branchname>:main
remote:  !
remote:  ! This article goes into details on the behavior:
remote:  !   https://devcenter.heroku.com/articles/duplicate-build-version
remote: 
remote: Verifying deploy...
remote: 
remote: !	Push rejected to seezetbot.
remote: 
To https://git.heroku.com/seezetbot.git
 ! [remote rejected] master -> master (pre-receive hook declined)
error: failed to push some refs to 'https://git.heroku.com/seezetbot.git'

頂いた回答から
$ heroku buildpacks:set heroku/nodejs
でビルドパックを導入し、
$ git push -f
を行いましたが、
再度エラーが出てしまいました。

Enumerating objects: 410, done.
Counting objects: 100% (410/410), done.
Delta compression using up to 4 threads
Compressing objects: 100% (402/402), done.
Writing objects: 100% (410/410), 774.13 KiB | 2.63 MiB/s, done.
Total 410 (delta 53), reused 0 (delta 0)
remote: Compressing source files... done.
remote: Building source:
remote: 
remote: -----> Node.js app detected
remote:        
remote: -----> Creating runtime environment
remote:        
remote:        NPM_CONFIG_LOGLEVEL=error
remote:        NODE_ENV=production
remote:        NODE_MODULES_CACHE=true
remote:        NODE_VERBOSE=false
remote:        
remote: -----> Installing binaries
remote:        engines.node (package.json):  12.x
remote:        engines.npm (package.json):   unspecified (use default)
remote:        
remote:        Resolving node version 12.x...
remote:        Downloading and installing node 12.19.1...
remote:        Using default npm version: 6.14.8
remote:        
remote: -----> Installing dependencies
remote:        Prebuild detected (node_modules already exists)
remote:        Rebuilding any native modules
remote:        discord.js@12.5.0 /tmp/build_4e186432/node_modules/discord.js
remote:        @discordjs/collection@0.1.6 /tmp/build_4e186432/node_modules/@discordjs/collection
remote:        @discordjs/form-data@3.0.1 /tmp/build_4e186432/node_modules/@discordjs/form-data
remote:        asynckit@0.4.0 /tmp/build_4e186432/node_modules/asynckit
remote:        combined-stream@1.0.8 /tmp/build_4e186432/node_modules/combined-stream
remote:        delayed-stream@1.0.0 /tmp/build_4e186432/node_modules/delayed-stream
remote:        mime-types@2.1.27 /tmp/build_4e186432/node_modules/mime-types
remote:        mime-db@1.44.0 /tmp/build_4e186432/node_modules/mime-db
remote:        abort-controller@3.0.0 /tmp/build_4e186432/node_modules/abort-controller
remote:        event-target-shim@5.0.1 /tmp/build_4e186432/node_modules/event-target-shim
remote:        node-fetch@2.6.1 /tmp/build_4e186432/node_modules/node-fetch
remote:        prism-media@1.2.2 /tmp/build_4e186432/node_modules/prism-media
remote:        setimmediate@1.0.5 /tmp/build_4e186432/node_modules/setimmediate
remote:        tweetnacl@1.0.3 /tmp/build_4e186432/node_modules/tweetnacl
remote:        ws@7.4.0 /tmp/build_4e186432/node_modules/ws
remote:        Installing any new modules (package.json)
remote:        removed 1 package and audited 15 packages in 0.38s
remote:        found 0 vulnerabilities
remote:        
remote:        
remote: -----> Build
remote:        
remote: -----> Caching build
remote:        - node_modules
remote:        
remote: -----> Pruning devDependencies
remote:        audited 15 packages in 0.361s
remote:        found 0 vulnerabilities
remote:        
remote:        
remote: -----> Build succeeded!
remote: -----> Discovering process types
remote: 
remote:  !     Push failed: cannot parse Procfile.
remote:  !     Please try pushing again.
remote:  !     If the problem persists, see http://help.heroku.com/ and provide Request ID c12a1788-449d-4e79-f8a2-572e69cec231.
remote: 
remote: 
remote:  !
remote:  ! ## Warning - The same version of this code has already been built: d424044463fbd9a6b8634b1766801feff87e6409
remote:  !
remote:  ! We have detected that you have triggered a build from source code with version d424044463fbd9a6b8634b1766801feff87e6409
remote:  ! at least twice. One common cause of this behavior is attempting to deploy code from a different branch.
remote:  !
remote:  ! If you are developing on a branch and deploying via git you must run
remote:  !
remote:  !     git push heroku <branchname>:main
remote:  !
remote:  ! This article goes into details on the behavior:
remote:  !   https://devcenter.heroku.com/articles/duplicate-build-version
remote: 
remote: Verifying deploy...
remote: 
remote: !	Push rejected to seezetbot.
remote: 
To https://git.heroku.com/seezetbot.git
 ! [remote rejected] master -> master (pre-receive hook declined)
error: failed to push some refs to 'https://git.heroku.com/seezetbot.git'

該当のソースコード

試したこと

node.jsのバージョンをpackage.jsonにて指定しました。
上記の方法で症状が治った方が他サイトの質問への回答で見たからです（そのサイトを履歴を辿っても発見できないのでソースを提示できません）。

以下がpackage.jsonの中身です。

{
  "name": "glitch-discord-bot",
  "version": "0.0.0",
  "description": "discord bot sample on Glitch",
  "main": "index.js",
  "dependencies": {
    "discord.js": "^12.3.1",
    "googleapis": "^60.0.1",
    "ytdl-core": "^3.4.0",
    "ffmpeg-static": "^4.2.7",
    "@discordjs/opus": "^0.3.2",
    "discord.js-reaction-controller": "^1.1.1",
    "keyv": "^4.0.3",
    "@keyv/sqlite": "^2.0.2",
    "ffmpeg-binaries": "^4.0.0",
    "node-opus": "^0.3.3",
    "wikijs": "^6.0.0",
    "isgd": "^1.1.3",
    "discord-anti-spam": "^2.4.1",
    "yt-search": "^2.4.2"
  },
  "devDependencies": {},
  "scripts": {
    "start": "node index.js",
    "test": "node index.js"
  },
  "engines": {
    "node": "12.x"
  }
}