Update mypy-dev to 1.14.0a7

[cdce8p]

Proposed change

https://github.com/cdce8p/mypy-dev/releases/tag/1.14.0a7
Compare: python/mypy@71ec4a6...be87d3d

• New option to no longer treat bytearray and memoryview as subclasses of bytes. This will become the default in mypy 2.0. Fixed most issues already. Just one type: ignore remaining.
  https://mypy.readthedocs.io/en/latest/command_line.html#cmdoption-mypy-strict-bytes
• Typeshed updates
• Minor improvements and bug fixes

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• Deprecation (breaking change to happen in the future)
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• Code quality improvements to existing code or addition of tests

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• This PR fixes or closes issue: fixes #
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[cdce8p]

Fixed upstream in aio-libs/aiohttp#10154
Will be included in the next aiohttp release.

FYI @bdraco