CI-unixish

reduced usage of `os.chdir()` in Python scripts #19560

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Run time

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Job	Run time
build_mathlib (ubuntu-22.04)	3m 29s
check_nonneg (macos-13)	54s
build_cmake (macos-13)	10m 5s
build (ubuntu-22.04)	12m 26s
build_uchar (ubuntu-22.04)	21s
build_cmake (ubuntu-22.04)	4m 11s
build_cmake_tinyxml2 (macos-13)	3m 35s
build_mathlib (macos-13)	4m 26s
build (macos-13)	14m 19s
check_nonneg (ubuntu-22.04)	21s
build_cmake_tinyxml2 (ubuntu-22.04)	3m 3s
build_uchar (macos-13)	48s
selfcheck	42m 45s
	1h 40m 43s