[Backport 2.x] Update to Netty 4.1.115.Final

[opensearch-trigger-bot]

Backport 8e097ee from #16661.

[github-actions]

❕ Gradle check result for 222e27a: UNSTABLE

• TEST FAILURES:

      1 org.opensearch.cluster.MinimumClusterManagerNodesIT.testThreeNodesNoClusterManagerBlock

Please review all flaky tests that succeeded after retry and create an issue if one does not already exist to track the flaky failure.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 71.86%. Comparing base (407a70d) to head (222e27a).
Report is 1 commits behind head on 2.x.

Additional details and impacted files

@@             Coverage Diff              @@
##                2.x   #16666      +/-   ##
============================================
+ Coverage     71.77%   71.86%   +0.08%     
- Complexity    65404    65420      +16     
============================================
  Files          5314     5314              
  Lines        305210   305210              
  Branches      44473    44473              
============================================
+ Hits         219069   219326     +257     
+ Misses        67908    67598     -310     
- Partials      18233    18286      +53     

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[opensearch-trigger-bot]

The backport to 1.x failed:

The process '/usr/bin/git' failed with exit code 128

To backport manually, run these commands in your terminal:

# Fetch latest updates from GitHub
git fetch
# Create a new working tree
git worktree add ../.worktrees/backport-1.x 1.x
# Navigate to the new working tree
pushd ../.worktrees/backport-1.x
# Create a new branch
git switch --create backport/backport-16666-to-1.x
# Cherry-pick the merged commit of this pull request and resolve the conflicts
git cherry-pick -x --mainline 1 480828ea4404add8c6bda904453898dd60217b51
# Push it to GitHub
git push --set-upstream origin backport/backport-16666-to-1.x
# Go back to the original working tree
popd
# Delete the working tree
git worktree remove ../.worktrees/backport-1.x

Then, create a pull request where the base branch is 1.x and the compare/head branch is backport/backport-16666-to-1.x.