BLD: update scipy-openblas, use -Dpkg_config_path (#30049) #30129
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Backport of #30049.
Closes #29391 by patching OpenBLAS. Hopefully by the time 0.3.31 is released we can remove the patch.
Also use spin build -- -Dpkg_config_path= instead of setting PKG_CONFIG_PATH in the normal (non-wheel building) CI.