Bump mypy from 0.960 to 1.5.1

[dependabot[bot]]

Bumps mypy from 0.960 to 1.5.1.

Commits

• de4f2ad [Release 1.5] Bump version to 1.5.1 to pick up last 2 CPs
• 2ff7c0d [release 1.5] stubtest: Fix __mypy-replace false positives (#15689) (#15751)
• 373b73a [Release 1.5] Update typing_extensions stubs (#15745)
• a6bd80e Remove +dev from version
• 9dd0d39 Manually revert "Add support for attrs.fields (#15021)" (#15674)
• 45e1bf7 Typeshed cherry-pick: Fix @​patch when new is missing (#10459) (#15673)
• 7a94183 Fix dataclass/protocol crash on joining types (#15629)
• 2ebd51e Teach stubgen to work with complex and unary expressions (#15661)
• 3983381 Fix testLiteralMeets failure (#15659)
• 3bf8521 Consistently avoid type-checking unreachable code (#15386)
• Additional commits viewable in compare view

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