Update dependency typing_extensions to v4.12.0

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
typing_extensions (changelog)	==4.9.0 -> ==4.12.0

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Release Notes

python/typing_extensions (typing_extensions)

v4.12.0

Compare Source

This release is mostly the same as 4.12.0rc1 but fixes one more
longstanding bug.

• Fix incorrect behaviour of typing_extensions.ParamSpec on Python 3.8 and
  3.9 that meant that
  isinstance(typing_extensions.ParamSpec("P"), typing.TypeVar) would have a
  different result in some situations depending on whether or not a profiling
  function had been set using sys.setprofile. Patch by Alex Waygood.

v4.11.0

Compare Source

This feature release provides improvements to various recently
added features, most importantly type parameter defaults (PEP 696).

There are no changes since 4.11.0rc1.

v4.10.0

Compare Source

This feature release adds support for PEP 728 (TypedDict with extra
items) and PEP 742 (TypeIs).

There are no changes since 4.10.0rc1.

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