ci: test with 3.12 #553

Job	Run time
lint	4m 3s
test (macos-latest, 3.8)	8m 25s
test (macos-latest, 3.9)	8m 44s
test (macos-latest, 3.10)	10m 44s
test (macos-latest, 3.11)	8m 20s
test (macos-latest, 3.12-dev)	11m 41s
test (ubuntu-latest, 3.8)	5m 44s
test (ubuntu-latest, 3.9)	5m 38s
test (ubuntu-latest, 3.10)	6m 56s
test (ubuntu-latest, 3.11)	5m 53s
test (ubuntu-latest, 3.12-dev)	9m 26s
test (windows-latest, 3.8)	8m 55s
test (windows-latest, 3.9)	8m 41s
test (windows-latest, 3.10)	8m 20s
test (windows-latest, 3.11)	9m 19s
test (windows-latest, 3.12-dev)	12m 25s
docs	3m 0s
coverage	4m 33s
Rustfmt	19s
Rust unit tests (ubuntu-latest)	3m 33s
Rust unit tests (macos-latest)	3m 7s
Rust unit tests (windows-latest)	4m 27s
typecheck	2m 16s
	2h 34m 29s

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