chore(deps): override vulnerable black transitive dependency

[vdusek]

Summary

• Added explicit black>=24.3.0 constraint to dev dependency group to override the vulnerable transitive dependency from pydoc-markdown -> docspec-python -> black
• Same fix as applied in apify-client-python#582

Test plan

• Pre-commit hooks pass (lint + type check)
• CI pipeline passes

🤖 Generated with Claude Code

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 81.91%. Comparing base (56aa42e) to head (c7a31ea).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff             @@
##           master     #774       +/-   ##
===========================================
+ Coverage   68.06%   81.91%   +13.85%     
===========================================
  Files          46       46               
  Lines        2693     2693               
===========================================
+ Hits         1833     2206      +373     
+ Misses        860      487      -373     

Flag	Coverage Δ
integration	55.95% <ø> (?)
unit	68.06% <ø> (ø)

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