ci: add codecov token for uploading

[bchew]

https://about.codecov.io/blog/january-product-update-updating-the-codecov-ci-uploaders-to-the-codecov-cli/

[sonarcloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
No data about Coverage
No data about Duplication

See analysis details on SonarCloud

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 93.54%. Comparing base (b68811d) to head (c3a5a73).
Report is 6 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master      #60   +/-   ##
=======================================
  Coverage   93.54%   93.54%           
=======================================
  Files           1        1           
  Lines          62       62           
  Branches       16       16           
=======================================
  Hits           58       58           
  Misses          4        4           

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