Bump xarray from 2025.1.1 to 2025.3.1

Bumps [xarray](https://github.com/pydata/xarray) from 2025.1.1 to 2025.3.1.
- [Release notes](https://github.com/pydata/xarray/releases)
- [Changelog](https://github.com/pydata/xarray/blob/main/HOW_TO_RELEASE.md)
- [Commits](pydata/xarray@v2025.01.1...v2025.03.1)

---
updated-dependencies:
- dependency-name: xarray
  dependency-version: 2025.3.1
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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Author: dependabot[bot]