Fix error in path normalization.

[tobiasraabe]

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 #84 (f72a0e4) into main (7f04fc9) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main      #84   +/-   ##
=======================================
  Coverage   90.06%   90.07%           
=======================================
  Files          58       58           
  Lines        4863     4867    +4     
=======================================
+ Hits         4380     4384    +4     
  Misses        483      483           

Flag	Coverage Δ
end_to_end	76.67% <66.66%> (-0.03%)	⬇️
integration	41.75% <33.33%> (-0.02%)	⬇️
unit	67.59% <100.00%> (+0.02%)	⬆️

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Impacted Files	Coverage Δ
src/_pytask/collect.py	96.99% <100.00%> (+0.02%)	⬆️
tests/test_collect.py	91.35% <100.00%> (+0.33%)	⬆️

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