Bump mypy from 0.981 to 1.5.1 in /requirements

[dependabot[bot]]

Bumps mypy from 0.981 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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[northernSage]

@dependabot rebase

[dependabot[bot]]

Dependabot does not support your Python version. Because of this, Dependabot cannot update this pull request.

[dependabot[bot]]

OK, I won't notify you again about this release, but will get in touch when a new version is available. If you'd rather skip all updates until the next major or minor version, let me know by commenting @dependabot ignore this major version or @dependabot ignore this minor version. You can also ignore all major, minor, or patch releases for a dependency by adding an ignore condition with the desired update_types to your config file.

If you change your mind, just re-open this PR and I'll resolve any conflicts on it.