Bump mypy from 0.991 to 1.4.1

[dependabot[bot]]

Bumps mypy from 0.991 to 1.4.1.

Commits

• 3534bac Remove +dev from version
• f36ea01 Fix async iterator body stripping (#15491)
• ba7887b Revert "Fix spurious errors on builtins.open (#15161)" (#15508)
• 16fe5da Fix readthedocs build (#15437)
• 9b327d1 Use consistent anchors for error codes (#15435)
• 32abe02 docs: ref redirector (#15432)
• e5a5b33 Unbreak CI (#15505)
• 81d01aa Fix PEP 561 editable install test case (#15493)
• eba351e Add pip as test requirement for PEP 660 editable installs (#15482)
• 9faffe8 Bump typing_extensions dependency (#15488)
• Additional commits viewable in compare view

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