Upgrade mypy (#948) #956

Job	Run time
linters (3.9, ubuntu-latest)	1m 43s
Testing on Python 3.8 (ubuntu-latest)	1m 45s
Testing on Python 3.8 (macos-13)	3m 4s
Testing on Python 3.8 (windows-2019)	2m 27s
Testing on Python 3.9 (ubuntu-latest)	1m 46s
Testing on Python 3.9 (macos-13)	3m 12s
Testing on Python 3.9 (windows-2019)	2m 22s
Testing on Python 3.10 (ubuntu-latest)	1m 57s
Testing on Python 3.10 (macos-13)	2m 25s
Testing on Python 3.10 (windows-2019)	3m 27s
Testing on Python 3.11 (ubuntu-latest)	1m 38s
Testing on Python 3.11 (macos-13)	2m 1s
Testing on Python 3.11 (windows-2019)	3m 6s
	30m 53s

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