Fix: Convert Github profile.id from int to string

[tom-richter]

Reasoning 💡

This Github profile.id should be converted from integer to string as described here: https://github.com/nextauthjs/adapters/issues/111. We should check if other adapters/functions still rely on profile.id being an integer.

BREAKING CHANGE:

For consistency around our built-in providers, the profile id is now converted to a string. If you had assumptions about the id being a number, you can do parseInt(profile.id, 10)

[vercel]

This pull request is being automatically deployed with Vercel (learn more).
To see the status of your deployment, click below or on the icon next to each commit.

🔍 Inspect: https://vercel.com/nextauthjs/next-auth/8Tj6KL1YDzQ3oeRjoAQ9ZjYY3Z8z
✅ Preview: https://next-auth-git-fork-tom-richter-main-nextauthjs.vercel.app

[balazsorban44]

Yeah.. 😕 I am a bit afraid that it might cause problems for people who currently expect this to be an integer actually. 😨 We might just want to hold onto this PR until v4.0 and you can use your workaround locally until then?

If it only were TS, I wouldn't mind, but here we actually change the code.