update ci

[larsbuntemeyer]

update ci workflows, fixes numpy<1.24 until latest cmor release.

[codecov-commenter]

Codecov Report

Merging #83 (d3077d0) into master (50ea0e2) will decrease coverage by 49.52%.
The diff coverage is n/a.

❗ Current head d3077d0 differs from pull request most recent head 343cff0. Consider uploading reports for the commit 343cff0 to get more accurate results

Additional details and impacted files

@@             Coverage Diff             @@
##           master      #83       +/-   ##
===========================================
- Coverage   77.83%   28.31%   -49.52%     
===========================================
  Files          19        1       -18     
  Lines        1006      113      -893     
===========================================
- Hits          783       32      -751     
+ Misses        223       81      -142     

Flag	Coverage Δ
unittests	28.31% <ø> (-49.52%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
cordex/core/utils.py	28.31% <0.00%> (-49.11%)	⬇️
cordex/regions/_regions.py
cordex/regions/_prudence.py
cordex/cmor/cmor.py
cordex/preprocessing/__init__.py
cordex/cmor/__init__.py
cordex/tables/__init__.py
cordex/preprocessing/preprocessing.py
cordex/regions/__init__.py
cordex/cmor/utils.py
... and 9 more