(Bad rebase) Fix issue #1318: Type (typehint) error for `db.relationship`

[cainmagi]

Fix the typehint inconsistence of db.relationship(...).

• fixes #1318
• Fix an issue when tox p fails because mypy is forbidden
  • This issue may be caused by upgrade of tox. My tox version is 4.12.0.
  • See details here: https://stackoverflow.com/a/47716994/8266012

Checklist:

• [ ] Add tests that demonstrate the correct behavior of the change. Tests should fail without the change.
  • Only bug fixing. No need to do this.
• [ ] Add or update relevant docs, in the docs folder and in code.
  • Only bug fixing. No need to do this.
• [x] Add an entry in CHANGES.rst summarizing the change and linking to the issue.
• [ ] Add .. versionchanged:: entries in any relevant code docs.
  • Only bug fixing. No need to do this.
• [x] Run pre-commit hooks and fix any issues.
• [x] Run pytest and tox, no tests failed.

[pamelafox]

It looks like you branched off main, but bugfixes should branch off latest 3.x branch, per https://github.com/pallets-eco/flask-sqlalchemy/blob/main/CONTRIBUTING.rst#start-coding

Can you rebase to branch off that branch instead? Thanks!

[cainmagi]

Sorry for not noticing it! I will try to rebase this PR later.

[cainmagi]

Sorry! It seems that the branch is messed up after rebasing it! I think I should submit a different PR to do this.