Fix TagBot.yml to use common secrets

[hakkelt]

Well, I overlooked some mistakes from AI code completion when I added subpackage registration tasks to TagBot action... :/

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 87.60%. Comparing base (8c31134) to head (b5f794b).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master      #37   +/-   ##
=======================================
  Coverage   87.60%   87.60%           
=======================================
  Files          45       45           
  Lines        3026     3026           
=======================================
  Hits         2651     2651           
  Misses        375      375           

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