Update dependency typing-extensions to v4.3.0

This MR contains the following updates:

Package	Update	Change
typing-extensions (changelog)	minor	==4.2.0 -> ==4.3.0

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Release Notes

python/typing_extensions

v4.3.0

Compare Source

• 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).

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