fix: pip cache failures in workflows

[xarvex]

From #255:

Ocassionally, a pip install will fail because of mismatched hashes, which from my research I believe this to be related to a cache error. This cannot easily be tested due to its seemingly random nature, but my hope is that my fix in using the action/setup-python workflow will avoid it.

Unfortunately the fix in 82037e5 seems to have just caused registered bad cache to be reused over and over. So, this serves as a sort of "opposite" to that and removes using the cache altogether.

Again, due to random nature, this cannot easily be tested and will show results over time.