release 3.12.0 #624

Job	Run time
lint	48s
build	40s
cleanup_buckets	46s
doc	1m 3s
test-docker	6m 49s
test-linux-bundle	6m 37s
test-windows-bundle (windows-2019)	9m 15s
test-windows-bundle (windows-latest)	9m 54s
test (ubuntu-latest, 3.7)	5m 12s
test (ubuntu-latest, 3.8)	1m 8s
test (ubuntu-latest, 3.9)	1m 10s
test (ubuntu-latest, 3.10)	1m 0s
test (ubuntu-latest, 3.11)	4m 41s
test (ubuntu-latest, 3.12)	1m 4s
test (ubuntu-latest, pypy-3.10)	7m 45s
test (macos-latest, 3.7)	3m 38s
test (macos-latest, 3.8)	2m 43s
test (macos-latest, 3.9)	1m 4s
test (macos-latest, 3.10)	1m 25s
test (macos-latest, 3.11)	4m 57s
test (macos-latest, 3.12)	2m 42s
test (windows-latest, 3.7)	6m 24s
test (windows-latest, 3.8)	2m 16s
test (windows-latest, 3.9)	1m 54s
test (windows-latest, 3.10)	1m 45s
test (windows-latest, 3.11)	7m 9s
test (windows-latest, 3.12)	2m 4s
	1h 35m 53s

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