update codecov-action and add token

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.33%. Comparing base (ad3efe5) to head (dcf295c).
Report is 11 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main     #138      +/-   ##
============================================
- Coverage     96.21%   95.33%   -0.89%     
- Complexity       86       93       +7     
============================================
  Files            25       28       +3     
  Lines           291      300       +9     
  Branches          2        2              
============================================
+ Hits            280      286       +6     
- Misses            7       10       +3     
  Partials          4        4              

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