Replace versioneer with setuptools-scm.

[tobiasraabe]

• Fix tests.
• Replace versioneer with setuptools-scm.
• fix.

Changes

Provide a description and/or bullet points to describe the changes in this PR.

Todo

• Reference issues which can be closed due to this PR with "Closes #x".
• Review whether the documentation needs to be updated.
• Document PR in docs/changes.rst.

[codecov]

Codecov Report

Merging #16 (fb09034) into main (3f28d72) will decrease coverage by 0.59%.
The diff coverage is 60.00%.

@@            Coverage Diff             @@
##             main      #16      +/-   ##
==========================================
- Coverage   99.08%   98.48%   -0.60%     
==========================================
  Files          13       13              
  Lines         329      331       +2     
==========================================
  Hits          326      326              
- Misses          3        5       +2     

Flag	Coverage Δ
end_to_end	85.49% <60.00%> (-0.52%)	⬇️
unit	67.67% <60.00%> (-0.42%)	⬇️

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Impacted Files	Coverage Δ
src/pytask_r/__init__.py	60.00% <60.00%> (-40.00%)	⬇️

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