Bump Python 3 to 3.12 #4139

Job	Run time
Build wheel and source distribution	31s
aarch64-unknown-linux-gnu (ubuntu-22.04)	3m 34s
x86_64-unknown-linux-gnu (ubuntu-22.04)	3m 25s
x86_64-unknown-linux-musl (ubuntu-22.04)	3m 41s
powerpc64le-unknown-linux-gnu (ubuntu-22.04)	3m 50s
x86_64-pc-windows-msvc (windows-2022)	7m 3s
i686-pc-windows-msvc (windows-2022)	6m 24s
aarch64-apple-darwin (macos-12)	6m 22s
x86_64-apple-darwin (macos-12)	9m 26s
Build macOS installer and sign/notarize artifacts	1m 25s
Build Windows installers	1m 12s
Publish release	0s
	46m 53s

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