fix: support submodules in worktree

[mtth]

No description provided.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 0% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 85.88%. Comparing base (88e541e) to head (67d9e2f).

Files with missing lines	Patch %	Lines
src/git_draft/toolbox.py	0.00%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #92      +/-   ##
==========================================
- Coverage   86.08%   85.88%   -0.21%     
==========================================
  Files          10       10              
  Lines         855      857       +2     
  Branches       64       65       +1     
==========================================
  Hits          736      736              
- Misses         96       98       +2     
  Partials       23       23              

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