fix: use correct compare changes URL for Bitbucket

[JaZo]

Fixes #256

[pi0]

thnx!

[codecov]

Codecov Report

Attention: Patch coverage is 80.00000% with 1 line in your changes missing coverage. Please review.

Project coverage is 45.12%. Comparing base (0914fd7) to head (957b43e).
Report is 57 commits behind head on main.

Files with missing lines	Patch %	Lines
src/repo.ts	80.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##             main     #257       +/-   ##
===========================================
- Coverage   69.10%   45.12%   -23.99%     
===========================================
  Files           9       12        +3     
  Lines         916      953       +37     
  Branches       85       96       +11     
===========================================
- Hits          633      430      -203     
- Misses        283      520      +237     
- Partials        0        3        +3     

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