Remove typing_extensions #45

Job	Run time
Testing on Python 3.8 (ubuntu-latest)	2m 35s
Testing on Python 3.8 (macOS-latest)	4m 47s
Testing on Python 3.8 (windows-latest)	6m 1s
linters (3.9, ubuntu-latest)	3m 1s
Testing on Python 3.9 (ubuntu-latest)	3m 12s
Testing on Python 3.9 (macOS-latest)	3m 9s
Testing on Python 3.9 (windows-latest)	6m 31s
Testing on Python 3.10 (ubuntu-latest)	2m 27s
Testing on Python 3.10 (macOS-latest)	3m 20s
Testing on Python 3.10 (windows-latest)	5m 42s
Testing on Python 3.11 (ubuntu-latest)	2m 34s
Testing on Python 3.11 (macOS-latest)	3m 27s
Testing on Python 3.11 (windows-latest)	6m 56s
	53m 42s

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