⬆ Upgrade internal testing dependencies: mypy to version 0.910, add newly needed type packages

[ArcLightSlavik]

Mypy has released a new version which includes a new nice features.

This PR includes:

1. Update mypy dependency to 0.901 from 0.812
2. Addition of 'types' dependencies due to update to Typeshed (http://mypy-lang.blogspot.com/2021/05/the-upcoming-switch-to-modular-typeshed.html)
3. Removal of mypy.ini and inclusion of it inside of pyproject.toml.

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Edit (by @tiangolo): I upgraded mypy and the new stubs to their current latest. I also added types-dataclasses that is needed for Python 3.6.

[Mause]

Should probably update this to 0.910 now?

[codecov]

Codecov Report

Merging #3350 (c6dd0f5) into master (189ac3e) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##            master     #3350   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          410       410           
  Lines        10281     10281           
=========================================
  Hits         10281     10281           

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[github-actions]

📝 Docs preview for commit 9a2b6dc at: https://615c0cdd729c83e4da89f680--fastapi.netlify.app

[tiangolo]

Awesome, thanks @ArcLightSlavik! 😎 🍰

And thanks @Mause for the comment. Yep, I upgraded mypy and the new stubs to their current latest. I also added types-dataclasses that is needed for Python 3.6.

This is included in FastAPI 0.68.3, just released. 🎉

[github-actions]

📝 Docs preview for commit c6dd0f5 at: https://615c0ec86b69c1b256a958c5--fastapi.netlify.app

[ArcLightSlavik]

Opps completely forgot to update this 🙈
Thanks @tiangolo !