v2.1.1

Extremely minor release to ensure compatibility with the soon-to-be released version of xarray (v2025.08.0).

What's Changed

• Empty release notes by @TomNicholas in #778
• Adjust for small change in signature of private xarray function _nested_combine by @TomNicholas in #779
• Eelease notes for v2.1.1 by @TomNicholas in #780

Full Changelog: v2.1.0...v2.1.1