Migrate from xclim.sdba to xsdba

[Zeitsperre]

Pull Request Checklist:

• This PR addresses an already opened issue (for bug fixes / features)
  • This PR fixes #xyz
• (If applicable) Documentation has been added / updated (for bug fixes / features).
• (If applicable) Tests have been added.
• CHANGELOG.rst has been updated (with summary of main changes).
  • Link to issue (:issue:number) and pull request (:pull:number) has been added.

What kind of change does this PR introduce?

• Updates xclim to the latest version and introduces xsdba
• Marks two tests that rely on the now-modified GDAL CLI.

Does this PR introduce a breaking change?

Yes, xclim no longer comes with SDBA support by default. While examples allow for xclim.sdba to be used, importing directly from xsdba is the suggested API.

Other information:

https://xsdba.readthedocs.io/en/latest/index.html

GDAL v3.11+ (available on macOS) includes major changes to the slope and hill shade algorithms. Default behaviour is changed. We may need to rewrite these to rely on Python-written algorithms if we want to ensure that the values remain similar.

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[coveralls]

coverage: 82.363% (+0.09%) from 82.274%
when pulling 9d267c8 on xsdba-support
into 4652e41 on master.