add depends_on

[tlambert03]

This pull request updates the compile_cython and _compile_module functions in src/witty/compile_module.py to improve cache invalidation by allowing users to specify additional dependency files.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 92.94%. Comparing base (d30f274) to head (2ea89ad).
⚠️ Report is 3 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #14   +/-   ##
=======================================
  Coverage   92.94%   92.94%           
=======================================
  Files           2        2           
  Lines         170      170           
=======================================
  Hits          158      158           
  Misses         12       12           

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