Update dimension listing in test expectations

[Zeitsperre]

Pull Request Checklist:

• [ ] This PR addresses an already opened issue (for bug fixes / features)

  • This PR fixes issue #xyz

• [ ] Tests for the changes have been added (for bug fixes / features)

• [ ] Documentation has been added / updated (for bug fixes / features)

• [ ] HISTORY.rst has been updated (with summary of main changes)

• [ ] I have added my relevant user information to AUTHORS.md

• What kind of change does this PR introduce?:

  • Updates the list of expected dimensions to include realization

• Does this PR introduce a breaking change?:

• Other information:

I don't exactly know why these tests are breaking all of a sudden. The source data is unchanged. Could it possibly de due to the new xarray or some other library?

[Zeitsperre]

Failures are expected due to incompatible pandas version required by upstream xarray

[aulemahal]

The bug you are fixing seems to have been triggered by roocs/roocs-utils#103, which added realization as a dimension known to clisops and family. I think clisops has no CI runs with the upstream version of roocs-utils ? Or simply, no commit were pushed between the change and the latest release.