Update typing-extensions to 4.9.0

[pyup-bot]

This PR updates typing-extensions from 4.8.0 to 4.9.0.

Changelog

4.9.0

This feature release adds `typing_extensions.ReadOnly`, as specified
by PEP 705, and makes various other improvements, especially to
`typing_extensions.deprecated()`.

There are no changes since 4.9.0rc1.

4.9.0rc1

- Add support for PEP 705, adding `typing_extensions.ReadOnly`. Patch
by Jelle Zijlstra.
- All parameters on `NewType.__call__` are now positional-only. This means that
the signature of `typing_extensions.NewType.__call__` now exactly matches the
signature of `typing.NewType.__call__`. Patch by Alex Waygood.
- Fix bug with using `deprecated` on a mixin class. Inheriting from a
deprecated class now raises a `DeprecationWarning`. Patch by Jelle Zijlstra.
- `deprecated` now gives a better error message if you pass a non-`str`
argument to the `msg` parameter. Patch by Alex Waygood.
- `deprecated` is now implemented as a class for better introspectability.
Patch by Jelle Zijlstra.
- Exclude `__match_args__` from `Protocol` members.
Backport of https://github.com/python/cpython/pull/110683 by Nikita Sobolev.
- When creating a `typing_extensions.NamedTuple` class, ensure `__set_name__`
is called on all objects that define `__set_name__` and exist in the values
of the `NamedTuple` class's class dictionary. Patch by Alex Waygood,
backporting https://github.com/python/cpython/pull/111876.
- Improve the error message when trying to call `issubclass()` against a
`Protocol` that has non-method members. Patch by Alex Waygood (backporting
https://github.com/python/cpython/pull/112344, by Randolph Scholz).

Links

• PyPI: https://pypi.org/project/typing-extensions
• Changelog: https://data.safetycli.com/changelogs/typing-extensions/

[pyup-bot]

Closing this in favor of #487