Remove spurious lines in workflow

[plietar]

The vault and youtrack tokens don't exist and aren't used. This is probably a copy-paste from somewhere else.

Also reduce the scope of the codecov token to just the relevant step.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.68%. Comparing base (6ec900c) to head (d279f3a).
Report is 9 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #55      +/-   ##
==========================================
- Coverage   99.28%   97.68%   -1.60%     
==========================================
  Files          45       50       +5     
  Lines        3351     4019     +668     
  Branches      527      661     +134     
==========================================
+ Hits         3327     3926     +599     
- Misses         21       67      +46     
- Partials        3       26      +23     

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