Update typehints within ./tests #1037

Job	Run time
linters (3.9, ubuntu-latest)	49s
Testing on Python 3.8 (ubuntu-latest)	54s
Testing on Python 3.8 (macos-13)	1m 35s
Testing on Python 3.8 (windows-2019)	2m 25s
Testing on Python 3.9 (ubuntu-latest)	50s
Testing on Python 3.9 (macos-13)	1m 28s
Testing on Python 3.9 (windows-2019)	2m 45s
Testing on Python 3.10 (ubuntu-latest)	53s
Testing on Python 3.10 (macos-13)	1m 30s
Testing on Python 3.10 (windows-2019)	2m 23s
Testing on Python 3.11 (ubuntu-latest)	54s
Testing on Python 3.11 (macos-13)	1m 25s
Testing on Python 3.11 (windows-2019)	2m 6s
Testing on Python 3.12 (ubuntu-latest)	56s
Testing on Python 3.12 (macos-13)	1m 40s
Testing on Python 3.12 (windows-2019)	4m 54s
	27m 27s

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