Use PDM instead of pip-tools to manage venv #22349
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Replace use of pip-tools to set up and maintain a Python virtual environment (currently, only on macOS) with PDM. In addition to supporting more modern Python conventions, including dependency groups (which reduces the number of files involved in managing the venv), PDM strives to be platform agnostic and should allow us to perform lock file updates once (or at least from a single platform), rather than having to separately update lock files for every supported platform.
This change is