CI: use 'uv' for installing Python dependencies on Windows (!4479) · Merge requests · graphviz / graphviz

It is hoped that installing uv and then using it to install third-party dependencies is faster than using pip.

Gitlab: #2661

Looking at build timestamps, it seems to take ~22-30s to install Python deps prior to this and ~15-22s after this (including uv installation time). So this indeed seems like a slight win in runtime.

CI: use 'uv' for installing Python dependencies on Windows

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