Pass CODECOV_TOKEN to action

[samdark]

Q	A
Is bugfix?	✔️/❌
New feature?	✔️/❌
Breaks BC?	✔️/❌

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 82.85%. Comparing base (1fb609b) to head (7463461).
Report is 56 commits behind head on master.

Additional details and impacted files

@@              Coverage Diff              @@
##             master     #257       +/-   ##
=============================================
+ Coverage     64.66%   82.85%   +18.18%     
- Complexity      558      623       +65     
=============================================
  Files            46       51        +5     
  Lines          1862     2105      +243     
=============================================
+ Hits           1204     1744      +540     
+ Misses          658      361      -297     

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