Fix env version detection on systems with multiple system Pythons #1003

Job	Run time
Tests (windows-latest, x86_64-pc-windows-msvc, yes)	11m 10s
Tests in Containers (ci-jupyter-container, ubuntu-latest, mcr.microsoft.com/devcontainers/univers...	4m 14s
Env Tests (ci-poetry-global, ubuntu-latest, x86_64-unknown-linux-musl)	2m 13s
Tests in Containers (ci-homebrew-container, ubuntu-latest, homebrew/brew, x86_64-unknown-linux-musl)	3m 11s
Tests (ubuntu-latest, x86_64-unknown-linux-musl, yes)	7m 33s
Builds (windows-latest, x86_64-pc-windows-msvc)	3m 45s
Env Tests (ci-poetry-project, ubuntu-latest, x86_64-unknown-linux-musl)	2m 25s
Tests (macos-latest, x86_64-apple-darwin, yes)	11m 8s
Builds (windows-latest, aarch64-pc-windows-msvc)	4m 2s
Env Tests (ci-poetry-custom, ubuntu-latest, x86_64-unknown-linux-musl)	2m 20s
Tests (macos-14, aarch64-apple-darwin, yes)	9m 35s
Builds (ubuntu-latest, x86_64-unknown-linux-musl, yes)	1m 50s
Env Tests (ci-poetry-global, windows-latest, x86_64-pc-windows-msvc)	5m 45s
Builds (macos-latest, x86_64-apple-darwin, yes)	1m 40s
Env Tests (ci-poetry-project, windows-latest, x86_64-pc-windows-msvc)	5m 5s
Builds (macos-14, aarch64-apple-darwin, yes)	1m 36s
Env Tests (ci-poetry-custom, windows-latest, x86_64-pc-windows-msvc)	6m 6s
	1h 23m 38s

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