Bump xarray from 2025.9.1 to 2025.10.0 (#758)

Bumps [xarray](https://github.com/pydata/xarray) from 2025.9.1 to 2025.10.0.
- [Release notes](https://github.com/pydata/xarray/releases)
- [Changelog](https://github.com/pydata/xarray/blob/main/HOW_TO_RELEASE.md)
- [Commits](pydata/xarray@v2025.09.1...v2025.10.0)

---
updated-dependencies:
- dependency-name: xarray
  dependency-version: 2025.10.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

doc/requirements.txt

@@ -5,7 +5,7 @@ Sphinx==8.2.3
 furo==2025.9.25
 ipython==9.6.0
 netCDF4==1.7.2
-xarray==2025.9.1
+xarray==2025.10.0
 matplotlib==3.10.6
 cmocean==4.0.3
 pickleshare==0.7.5