fix: tighten uv version parser and platform-gate SYSTEMROOT in test c… #1398

Job	Run time
Tests in Containers (ci-homebrew-container, ubuntu-latest, homebrew/brew, x86_64-unknown-linux-musl)	4m 3s
Tests in Containers (ci-jupyter-container, ubuntu-latest, mcr.microsoft.com/devcontainers/univers...	4m 34s
Tests (macos-14, aarch64-apple-darwin, yes)	10m 55s
Builds (macos-latest, x86_64-apple-darwin, yes)	3m 8s
Tests (ubuntu-latest, x86_64-unknown-linux-musl, yes)	9m 6s
Tests (windows-latest, x86_64-pc-windows-msvc, yes)	11m 34s
Builds (windows-latest, x86_64-pc-windows-msvc)	5m 14s
Tests (macos-latest, x86_64-apple-darwin, yes)	12m 38s
Builds (windows-latest, aarch64-pc-windows-msvc)	5m 17s
Builds (ubuntu-latest, x86_64-unknown-linux-musl, yes)	2m 13s
Env Tests (ci-poetry-global, windows-latest, x86_64-pc-windows-msvc)	6m 51s
Env Tests (ci-poetry-project, windows-latest, x86_64-pc-windows-msvc)	5m 15s
Builds (macos-14, aarch64-apple-darwin, yes)	3m 12s
Env Tests (ci-poetry-custom, windows-latest, x86_64-pc-windows-msvc)	5m 39s
Env Tests (ci-poetry-custom, ubuntu-latest, x86_64-unknown-linux-musl)	2m 54s
Env Tests (ci-poetry-project, ubuntu-latest, x86_64-unknown-linux-musl)	2m 38s
Env Tests (ci-poetry-global, ubuntu-latest, x86_64-unknown-linux-musl)	2m 57s
	1h 38m 8s

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