Add sub to defaultJwtPayload for credentials provider.

[dogomedia-github]

What:
The default jwt payload for the credentials provider is missing the sub field. This fix adds the sub field to the jwt payload, making it consistent with the jwt payload for the oauth and email providers.

Why:
The sub is missing when using jwt sessions and credentials provider. This means that users can only be identified by their email and not by the sub value.

How:

In src/server/routes/session.js:

Change

    const defaultJwtPayload = {
      name: user.name,
      email: user.email,
      picture: user.image
    }

to

    const defaultJwtPayload = {
      name: user.name,
      email: user.email,
      picture: user.image,
      sub: user.id?.toString()
    }

Checklist:

• Documentation - NA
• Tests - NA
• Ready to be merged

It's a single line code change, so should be a pretty safe change.

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[Joaovsa7]

Can you update your branch? it's out-of-date with the base branch.

[dogomedia-github]

@Joaovsa7 Ok, I've updated the branch.

[balazsorban44]

don't see how that would block anything. just use the jwt callback to add an ID for the time being.
Read the docs please: https://next-auth.js.org/configuration/callbacks#jwt-callback

At its best, this PR is just a convenience change.

[github-actions]

🎉 This PR is included in version 3.15.1 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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