flask-sqlalchemy
                                
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                        Improve type hint
I found that the return type of get_or_404 is Any now. This PR will  bound return type to bond to Self
Checklist:
- [ ] Add tests that demonstrate the correct behavior of the change. Tests should fail without the change.
- [ ] Add or update relevant docs, in the docs folder and in code.
- [ ] Add an entry in CHANGES.rstsummarizing the change and linking to the issue.
- [ ] Add .. versionchanged::entries in any relevant code docs.
- [x] Run pre-commithooks and fix any issues.
- [x] Run pytestandtox, no tests failed.
@hydra-zim Is this ready for review? I notice you haven't completed the tasks on the checklist, like updating the changelog. Please go through those.