Update code-of-conduct.md

[artemgavrilov]

It seems that COC was copied from PG operator repo.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 84.55%. Comparing base (3d84610) to head (4e963ba).
Report is 12 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #453      +/-   ##
==========================================
- Coverage   90.55%   84.55%   -6.01%     
==========================================
  Files           3        3              
  Lines        1271     1269       -2     
  Branches       35      196     +161     
==========================================
- Hits         1151     1073      -78     
  Misses         98       98              
- Partials       22       98      +76     

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