Use pythonpath #593

Job	Run time
cache_libs / cache_libs (windows-11-arm)	35s
cache_libs / cache_libs (ubuntu-22.04-arm)	18s
cache_libs / cache_libs (windows-2022)	25s
cache_libs / cache_libs (macos-latest)	11s
cache_libs / cache_libs (ubuntu-22.04)	11s
manylinux (cp314-cp314, manylinux_2_28_x86_64)	1m 9s
manylinux (cp314-cp314, musllinux_1_2_x86_64)	1m 10s
manylinux (cp314-cp314, manylinux2014_x86_64)	56s
	4m 55s

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