Updating xarray

[davidorme]

Description

This PR updates the xarray requirement to the most recent version to try and replicate the issue reported in #257. Although #257 was closed as unreproducible and likely a Python environment issue, it still makes sense to update.

Fixes # (issue)

Type of change

• [ ] New feature (non-breaking change which adds functionality)
• [ ] Optimization (back-end change that speeds up the code)
• [x] Bug fix (non-breaking change which fixes an issue)

Key checklist

• [x] Make sure you've run the pre-commit checks: $ pre-commit run -a
• [x] All tests pass: $ poetry run pytest

Further checks

• [ ] Code is commented, particularly in hard-to-understand areas
• [ ] Tests added that prove fix is effective or that feature works

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 95.24%. Comparing base (a800662) to head (6d57725). Report is 23 commits behind head on develop.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## develop #258 +/- ## ======================================== Coverage 95.24% 95.24% ======================================== Files 28 28 Lines 1703 1703 ======================================== Hits 1622 1622 Misses 81 81 ```

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[j-emberton]

Would you like me to assign this PR to myself and review?