GitHub/Actions: Fix deduplication for multiple workflows per repository

[amotl]

Problem

A few items have not been displayed, when multiple different workflows belonged to the same repository.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 3 lines in your changes missing coverage. Please review.

Project coverage is 56.50%. Comparing base (47bcb25) to head (392d9d2).
Report is 6 commits behind head on main.

Files with missing lines	Patch %	Lines
src/rapporto/source/github/actions.py	0.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #42      +/-   ##
==========================================
+ Coverage   56.48%   56.50%   +0.02%     
==========================================
  Files          28       28              
  Lines        1983     1982       -1     
==========================================
  Hits         1120     1120              
+ Misses        863      862       -1     

Flag	Coverage Δ
unittests	56.50% <0.00%> (+0.02%)	⬆️

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