[Backport] [1.3] Update to Netty 4.1.115.Final (#16661) (#16666) (#16672)

[reta]

Backport of https://github.com/opensearch-project/OpenSearch/pull/16661 to 1.3 to

[github-actions[bot]]

:white_check_mark: Gradle check result for 3df49caecb6c8de37bef07773668c6fede028d41: SUCCESS

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 77.60%. Comparing base (05f4aac) to head (3df49ca). Report is 34 commits behind head on 1.3.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## 1.3 #16686 +/- ## ============================================ + Coverage 77.56% 77.60% +0.03% - Complexity 58760 58766 +6 ============================================ Files 4223 4223 Lines 253441 253459 +18 Branches 38701 38692 -9 ============================================ + Hits 196590 196694 +104 + Misses 40844 40799 -45 + Partials 16007 15966 -41 ```

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