Freeze package .whl versions somehow

[BradyAJohnston]

Currently every time we run build.py, even if on the same version, some of the installed versions update. This can break things if we are storing the versions in the blender_manifest.toml and that moves between computers, on a new computer the build script has to be run again to ensure the built .whl files are of the same version.

This should probably be cached / snapshot more strictly, ensuring the shipped .whl versions are remaining the same and only change between minor version changes not patches.