update python env to 3.12.6 (#18612) #4151

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 29s
x86_64-unknown-linux-musl (ubuntu-22.04)	5m 0s
powerpc64le-unknown-linux-gnu (ubuntu-22.04)	3m 45s
x86_64-pc-windows-msvc (windows-2022)	7m 22s
i686-pc-windows-msvc (windows-2022)	6m 58s
aarch64-apple-darwin (macos-12)	6m 24s
x86_64-apple-darwin (macos-12)	5m 46s
Build macOS installer and sign/notarize artifacts	1m 24s
Build Windows installers	1m 0s
Publish release	0s
	45m 13s

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