Update typehints within ./tests (#973) #1039

Job	Run time
linters (3.9, ubuntu-latest)	50s
Testing on Python 3.8 (ubuntu-latest)	54s
Testing on Python 3.8 (macos-13)	1m 57s
Testing on Python 3.8 (windows-2019)	2m 7s
Testing on Python 3.9 (ubuntu-latest)	54s
Testing on Python 3.9 (macos-13)	1m 28s
Testing on Python 3.9 (windows-2019)	2m 12s
Testing on Python 3.10 (ubuntu-latest)	57s
Testing on Python 3.10 (macos-13)	1m 20s
Testing on Python 3.10 (windows-2019)	2m 13s
Testing on Python 3.11 (ubuntu-latest)	58s
Testing on Python 3.11 (macos-13)	1m 59s
Testing on Python 3.11 (windows-2019)	2m 10s
Testing on Python 3.12 (ubuntu-latest)	1m 1s
Testing on Python 3.12 (macos-13)	1m 42s
Testing on Python 3.12 (windows-2019)	5m 45s
	28m 27s

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