Replace explicit codecov token with tokenless-OIDC authentication

[JackPGreen]

See hazelcast/hazelcast-csharp-client#1031

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 93.43%. Comparing base (6080b51) to head (66e2e70).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1568      +/-   ##
==========================================
+ Coverage   93.42%   93.43%   +0.01%     
==========================================
  Files         466      466              
  Lines       16628    16628              
  Branches     1350     1350              
==========================================
+ Hits        15534    15536       +2     
+ Misses        800      798       -2     
  Partials      294      294              

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