Fix: find `libpython` for venvs created by `uv` #1282

Job	Run time
OS=macOS-latest R=release py=3.10	3m 41s
OS=windows-latest R=release py=3.10	10m 3s
OS=ubuntu-latest R=release py=3.10	5m 11s
OS=macOS-latest R=oldrel py=3.10	3m 45s
OS=ubuntu-latest R=oldrel-1 py=3.9	5m 10s
OS=ubuntu-latest R=oldrel-2 py=3.9	8m 11s
OS=ubuntu-20.04 R=oldrel-3 py=3.8	6m 6s
OS=ubuntu-20.04 R=oldrel-4 py=3.8	5m 33s
OS=ubuntu-latest R=release py=3.7	6m 36s
OS=ubuntu-latest R=release py=3.8	5m 13s
OS=ubuntu-latest R=release py=3.9	5m 20s
OS=ubuntu-latest R=release py=3.11	5m 10s
OS=ubuntu-latest R=release py=3.12	5m 11s
OS=ubuntu-latest R=devel py=3.12	10m 28s
	1h 25m 38s

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