Setting xarray to version 2026.7.0

[fmalatino]

Description
This PR sets the installed version of xarray to 2026.7.0 to prevent breakages in the CI workflow due to a conflict with the version of zarr needed.

How Has This Been Tested?
Current CI

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• Any dependent changes have been merged and published in downstream modules
• New check tests, if applicable, are included

[FlorianDeconinck]

@fmalatino / @oelbert let's get this in so the rest of the CIs are unblocked