⬆️ Bump xarray from 0.17.0 to 0.18.2 (#294)

Bumps [xarray](https://github.com/pydata/xarray) from 0.17.0 to 0.18.2.
- [Release notes](https://github.com/pydata/xarray/releases)
- [Changelog](https://github.com/pydata/xarray/blob/main/HOW_TO_RELEASE.md)
- [Commits](pydata/xarray@v0.17.0...v0.18.2)

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Co-authored-by: dependabot-preview[bot] <27856297+dependabot-preview[bot]@users.noreply.github.com>

pyproject.toml

@@ -40,7 +40,7 @@ pyproj = "^3.0.1"
 scikit-learn = "^0.24.1"
 tqdm = "^4.61.1"
 uncertainties = "^3.1.5"
-xarray = "^0.17.0"
+xarray = "^0.18.2"
 
 [tool.poetry.dev-dependencies]
 black = "^20.8b1"