Convert DeprecationWarning to FutureWarning for deprecated decorators.

[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

Patch coverage: 100.00% and no project coverage change.

Comparison is base (262d6e7) 95.42% compared to head (354d185) 95.42%.

❗ Current head 354d185 differs from pull request most recent head b7beb18. Consider uploading reports for the commit b7beb18 to get more accurate results

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #420   +/-   ##
=======================================
  Coverage   95.42%   95.42%           
=======================================
  Files          95       95           
  Lines        8408     8408           
=======================================
  Hits         8023     8023           
  Misses        385      385           

Flag	Coverage Δ
end_to_end	82.95% <100.00%> (ø)
integration	39.40% <0.00%> (ø)
unit	65.16% <0.00%> (+0.03%)	⬆️

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Files Changed	Coverage Δ
src/_pytask/mark/structures.py	90.54% <ø> (ø)
tests/test_mark.py	100.00% <100.00%> (ø)

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