Update nightly wheels source

[anissa111]

PR Summary

Closes #536

• updates nightly wheels source
• adds xarray to nightly wheels instead of source installation

PR Checklist

General

• Make an issue if one doesn't already exist
• Link the issue this PR resolves by adding closes #XXX to the PR description where XXX is the number of the issue.
• Add a brief summary of changes to docs/release-notes.rst in a relevant section for the next unreleased release. Possible sections include: Documentation, New Features, Bug Fixes, Internal Changes, Breaking Changes/Deprecated
• Add appropriate labels to this PR
• Make your changes in a forked repository rather than directly in this repo
• Passes precommit. To set up on your local, run pre-commit install from the top level of the repository. To manually run pre-commits, use pre-commit run --all-files and re-add any changed files before committing again and pushing.
• If needed, squash and merge PR commits into a single commit to clean up commit history

[anissa111]

See passing upstream tests on my fork here: https://github.com/anissa111/geocat-comp/actions/runs/7389250822/job/20101690107