Bump mypy from 0.910 to 0.930

[dependabot]

Bumps mypy from 0.910 to 0.930.

Commits

• 5d765e7 Bump version to 0.930
• aaa2685 Various small documentation updates (#11817)
• 3b913a4 Documents explicit type aliases (#11800)
• 768ce5b Allow calling a function with name '_' (#11810)
• b31b06b Enums with annotations and no values are fine to be subclassed (#11579)
• 750b77d [0.930 backport] update curses stubs, cherry pick fix (#11785)
• 7830d6d [0.930 backport] Fix PathLike regression (#11775)
• 5919e92 Fix tests for Python 3.10.1 (2) (#11756)
• d595468 Update version to 0.930+dev (#11770)
• 22ab84a Fix inferring constrainta from param spec callable against Any (#11725)
• Additional commits viewable in compare view

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[tomchristie]

This is a good example of a case where the infrastructure around Python's typing can sometimes create non-valuable busy work. Whatever's changed here wrt. either a new version of mypy or a new version of the trio_typing package, it's not adding anything of value to us.

Here's the error that's causing the CI to fail...

Error importing plugin "trio_typing.plugin": cannot import name 'TypeVarDef' from 'mypy.types'

Going to dig into resolving this.

[tomchristie]

One part of this CI failure was addressed by #469.

There's also another set of mypy errors introduced by this update:

httpcore/backends/sync.py:24: error: Argument 1 to "map_exceptions" has incompatible type "Dict[Type[OSError], Type[Exception]]"; expected "Mapping[Type[Exception], Type[Exception]]"
httpcore/backends/sync.py:33: error: Argument 1 to "map_exceptions" has incompatible type "Dict[Type[OSError], Type[Exception]]"; expected "Mapping[Type[Exception], Type[Exception]]"
httpcore/backends/sync.py:49: error: Argument 1 to "map_exceptions" has incompatible type "Dict[Type[OSError], Type[Exception]]"; expected "Mapping[Type[Exception], Type[Exception]]"
httpcore/backends/sync.py:75: error: Argument 1 to "map_exceptions" has incompatible type "Dict[Type[OSError], Type[Exception]]"; expected "Mapping[Type[Exception], Type[Exception]]"
httpcore/backends/sync.py:85: error: Argument 1 to "map_exceptions" has incompatible type "Dict[Type[OSError], Type[Exception]]"; expected "Mapping[Type[Exception], Type[Exception]]"

I've addressed that by easing up the type signature on map_exceptions.