test the built wheels with different python versions

[reyammer]

This is actually important: we pushed out an -rc release that cannot be installed with uv on python 3.8 and 3.9; and we only noticed after it was published (via the scheduled "test published -rc package").

The idea would be: build the wheels, upload them, test each of the wheel within its appropriate platform (e.g., windows => windows), but vary the python versions we are supposed to support. And we declare success only then.