Add support for Python 3.11 and 3.12. #6

Job	Run time
test (ubuntu-latest, 26.3, false)	55s
test (ubuntu-latest, 26.3, false)	55s
test (ubuntu-latest, 27.2, false)	51s
test (ubuntu-latest, 27.2, false)	51s
test (ubuntu-latest, 28.2, false)	52s
test (ubuntu-latest, 28.2, false)	52s
test (ubuntu-latest, 29.1, false)	50s
test (ubuntu-latest, 29.1, false)	50s
test (macos-latest, 26.3, false)	2m 42s
test (macos-latest, 26.3, false)	2m 42s
test (macos-latest, 27.2, false)	2m 40s
test (macos-latest, 27.2, false)	2m 40s
test (macos-latest, 28.2, false)	5m 49s
test (macos-latest, 28.2, false)	5m 49s
test (macos-latest, 29.1, false)	2m 39s
test (macos-latest, 29.1, false)	2m 39s
test (windows-latest, 26.3, false)	2m 17s
test (windows-latest, 26.3, false)	2m 17s
test (windows-latest, 27.2, false)	1m 0s
test (windows-latest, 27.2, false)	1m 0s
test (windows-latest, 28.2, false)	41s
test (windows-latest, 28.2, false)	41s
test (windows-latest, 29.1, false)	47s
test (windows-latest, 29.1, false)	47s
test (ubuntu-latest, snapshot, true)	51s
test (ubuntu-latest, snapshot, true)	51s
test (macos-latest, snapshot, true)	2m 7s
test (macos-latest, snapshot, true)	2m 7s
test (windows-latest, snapshot, true)	36s
test (windows-latest, snapshot, true)	45s
	51m 23s

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