Removed typing_extensions from vendored dependencies #4347
Merged
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Summary of changes
Removed
typing_extensionsfrom vendored dependencies.All vendored dependencies put
typing_extensionsbehind aTYPE_CHECKINGblock, in a stub file, or behind a Python 3.8+ check. Hence it is no longer necessary to vendortyping_extensions. (and if a vendored library re-introduce a problem importing it at runtime, we can either raise an issue upstream and wait for the next version, or re-introduce a patch to make it conditional rather than use a vendor version).Closes #4324
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