CI failing on Windows all of a sudden

[asmaloney]

I have no idea why the CI is failing to find Xerces on Windows all of a sudden without any changes in the repo. Could be the CI runner, miniconda, CMake, or something else entirely.

I spent a bunch of time in this branch trying to figure it out (also switched to micromamba which seems like a good move) and I'm giving up.

I updated all the actions to get rid of some warnings and I'm going to leave it there.

If you care about the Windows CI builds, feel free to take a look and submit a PR.