Bump typing-extensions from 4.2.0 to 4.3.0

Bumps typing-extensions from 4.2.0 to 4.3.0.

Changelog

Sourced from typing-extensions's changelog.

Release 4.3.0 (July 1, 2022)

• Add typing_extensions.NamedTuple, allowing for generic NamedTuples on Python <3.11 (backport from python/cpython#92027, by Serhiy Storchaka). Patch by Alex Waygood (@AlexWaygood).
• Adjust typing_extensions.TypedDict to allow for generic TypedDicts on Python <3.11 (backport from python/cpython#27663, by Samodya Abey). Patch by Alex Waygood (@AlexWaygood).

Commits

• 9c0759a Prepare release 4.3.0 (#52)
• 1baf0a5 Backport generic TypedDicts (#46)
• 7c28357 Add a backport of generic NamedTuples (#44)
• 7198c63 Add .gitignore, .editorconfig, CONTRIBUTING.md (#43)
• abe4390 dataclass_transform will be in 3.11 (#42)
• e9d09b5 Remove obsolete README.rst (#41)
• 447b62c fix CI (#4)
• 47600f6 update links (#3)
• bc9317e Change home URL to tree instead of README (#1157)
• c10296f Add a README.rst file back temporarily. (#1156)
• Additional commits viewable in compare view