Make uv an optional dependency again

[sbidoul]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 60.00000% with 6 lines in your changes missing coverage. Please review.

Project coverage is 93.53%. Comparing base (b3f0d88) to head (82c20cc).
Report is 7 commits behind head on master.

Files with missing lines	Patch %	Lines
src/pip_deepfreeze/sanity.py	50.00%	6 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #162      +/-   ##
==========================================
- Coverage   93.80%   93.53%   -0.28%     
==========================================
  Files          31       31              
  Lines        1938     1949      +11     
  Branches      347      246     -101     
==========================================
+ Hits         1818     1823       +5     
- Misses         87       93       +6     
  Partials       33       33              

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