chore: add Kong 3.7 to test matrix

[pmalek]

Summary

• add Kong 3.7 to test matrix
• bump golangci/golangci-lint-action from v4 to v6
• bump codecov/codecov-action from v3 to v4
• add concurrency groups to integration and EE integration workflows

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 42.72%. Comparing base (299110b) to head (e97909d).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #123      +/-   ##
==========================================
+ Coverage   41.35%   42.72%   +1.37%     
==========================================
  Files          75       75              
  Lines       10896     8819    -2077     
==========================================
- Hits         4506     3768     -738     
+ Misses       5926     4587    -1339     
  Partials      464      464              

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.