use python 3.12 #929

Job	Run time
lint	40s
build	36s
cleanup_buckets	30s
test-linux-bundle	7m 9s
test (ubuntu-latest, 3.7)	5m 28s
test-windows-bundle (windows-2019)	9m 11s
test-docker	5m 16s
test (ubuntu-latest, 3.8)	1m 0s
test-windows-bundle (windows-latest)	10m 14s
test (ubuntu-latest, 3.9)	1m 3s
test (ubuntu-latest, 3.10)	56s
test (ubuntu-latest, 3.11)	57s
test (ubuntu-latest, 3.12)	4m 13s
test (ubuntu-latest, pypy-3.10-nightly)	8m 39s
test (macos-latest, 3.7)	6m 4s
test (macos-latest, 3.8)	2m 23s
test (macos-latest, 3.9)	1m 6s
test (macos-latest, 3.10)	1m 11s
test (macos-latest, 3.11)	57s
test (macos-latest, 3.12)	5m 25s
test (windows-latest, 3.7)	6m 37s
test (windows-latest, 3.8)	1m 15s
test (windows-latest, 3.9)	1m 20s
test (windows-latest, 3.10)	1m 28s
test (windows-latest, 3.11)	1m 34s
test (windows-latest, 3.12)	6m 22s
doc	1m 23s
	1h 32m 57s

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