Use dedicated token for pr assignment

[svenklemm]

Since changing the default permissions of the GITHUB_TOKEN this workflow was failing with insufficient permissions.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 80.93%. Comparing base (59f50f2) to head (282bb3f). Report is 136 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6868      +/-   ##
==========================================
+ Coverage   80.06%   80.93%   +0.86%     
==========================================
  Files         190      198       +8     
  Lines       37181    37291     +110     
  Branches     9450     9738     +288     
==========================================
+ Hits        29770    30181     +411     
- Misses       2997     3202     +205     
+ Partials     4414     3908     -506     

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