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 :white_check_mark:

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

Additional details and impacted files

```diff @@ 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 ```

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