fix all pycodestyle E303 warnings in all folders c*

[fchapoton]

📚 Description

This fixes the pycodestyle warning

E303 too many blank lines (2)

inside all subfolders of sage whose name starts with c

Entirely done using autopep8.

📝 Checklist

• I have made sure that the title is self-explanatory and the description concisely explains the PR.
• I have linked an issue or discussion.
• I have created tests covering the changes.
• I have updated the documentation accordingly.

⌛ Dependencies

[codecov-commenter]

Codecov Report

Patch coverage has no change and project coverage change: -0.01 ⚠️

Comparison is base (c00e6c2) 88.62% compared to head (cba2d59) 88.62%.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop   #35151      +/-   ##
===========================================
- Coverage    88.62%   88.62%   -0.01%     
===========================================
  Files         2148     2148              
  Lines       398855   398855              
===========================================
- Hits        353480   353470      -10     
- Misses       45375    45385      +10     

Impacted Files	Coverage Δ
src/sage/calculus/calculus.py	70.48% <ø> (ø)
src/sage/categories/affine_weyl_groups.py	100.00% <ø> (ø)
src/sage/categories/algebras_with_basis.py	96.22% <ø> (ø)
src/sage/categories/category.py	98.01% <ø> (ø)
src/sage/categories/classical_crystals.py	100.00% <ø> (ø)
src/sage/categories/coalgebras.py	100.00% <ø> (ø)
...omplex_reflection_or_generalized_coxeter_groups.py	95.04% <ø> (ø)
src/sage/categories/crystals.py	87.74% <ø> (ø)
...mples/graded_connected_hopf_algebras_with_basis.py	100.00% <ø> (ø)
src/sage/categories/examples/sets_cat.py	100.00% <ø> (ø)
... and 34 more

... and 23 files with indirect coverage changes

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[vbraun]

Merge conflict

[github-actions]

Documentation preview for this PR is ready! 🎉
Built with commit: cba2d59

[fchapoton]

setting back to positive after easy merge