build-python: Bump to Python 3.12.7 #1464

Job	Run time
prepare	2s
macos	0s
linux-asserts	0s
linux	3h 0m 43s
msys2	0s
linux-test-cross-build-ffmpeg	0s
linux-cross-windows (i686, ucrt)	3h 7m 57s
linux-cross-aarch64	0s
linux-cross-windows (x86_64, ucrt)	3h 9m 35s
linux-cross-windows (armv7, ucrt)	3h 3m 21s
linux-cross-windows (aarch64, ucrt)	3h 7m 1s
test-openmp (i686)	9m 0s
test-libcxx (x86_64, i686-w64-mingw32-)	1h 10m 25s
test-openmp (x86_64, -m64)	8m 59s
test-compiler-rt (x86_64)	11m 55s
test-ffmpeg	0s
test-libcxx (x86_64)	1h 11m 19s
test-compiler-rt (i686)	11m 7s
test-toolchain (x86_64)	2m 8s
test-toolchain (i686)	2m 15s
upload-nightly	0s
	18h 35m 47s

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