Bump xarray from 2024.7.0 to 2024.9.0 (#650)

Bumps [xarray](https://github.com/pydata/xarray) from 2024.7.0 to 2024.9.0.
- [Release notes](https://github.com/pydata/xarray/releases)
- [Changelog](https://github.com/pydata/xarray/blob/main/HOW_TO_RELEASE.md)
- [Commits](pydata/xarray@v2024.07.0...v2024.09.0)

---
updated-dependencies:
- dependency-name: xarray
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

doc/requirements.txt

@@ -5,7 +5,7 @@ Sphinx==8.0.2
 furo==2024.8.6
 ipython==8.27.0
 netCDF4==1.7.1.post2
-xarray==2024.7.0
+xarray==2024.9.0
 matplotlib==3.9.2
 cmocean==4.0.3
 pickleshare==0.7.5