Bump apache-rat from 0.13 to 0.15

[dependabot]

Bumps apache-rat from 0.13 to 0.15.

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[github-actions]

Gradle Check (Jenkins) Run Completed with:

• RESULT: FAILURE ❌
• URL: https://build.ci.opensearch.org/job/gradle-check/8702/
• CommitID: 425986a
  Please examine the workflow log, locate, and copy-paste the failure(s) below, then iterate to green.
  Is the failure a flaky test unrelated to your change?

[github-actions]

Gradle Check (Jenkins) Run Completed with:

• RESULT: SUCCESS ✅
• URL: https://build.ci.opensearch.org/job/gradle-check/8712/
• CommitID: 8df4338

[codecov-commenter]

Codecov Report

Merging #5675 (8df4338) into main (361133c) will increase coverage by 0.13%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##               main    #5675      +/-   ##
============================================
+ Coverage     70.96%   71.10%   +0.13%     
- Complexity    58554    58688     +134     
============================================
  Files          4760     4760              
  Lines        279515   279515              
  Branches      40348    40348              
============================================
+ Hits         198363   198746     +383     
+ Misses        64965    64605     -360     
+ Partials      16187    16164      -23     

Impacted Files	Coverage Δ
...opensearch/gradle/testclusters/OpenSearchNode.java	0.00% <ø> (ø)
.../java/org/opensearch/node/NodeClosedException.java	50.00% <0.00%> (-50.00%)	⬇️
.../java/org/opensearch/search/dfs/AggregatedDfs.java	51.61% <0.00%> (-45.17%)	⬇️
...opensearch/persistent/PersistentTasksExecutor.java	22.22% <0.00%> (-44.45%)	⬇️
...ava/org/opensearch/search/dfs/DfsSearchResult.java	47.87% <0.00%> (-39.37%)	⬇️
...h/action/ingest/SimulateDocumentVerboseResult.java	60.71% <0.00%> (-39.29%)	⬇️
...pensearch/action/ingest/DeletePipelineRequest.java	31.25% <0.00%> (-37.50%)	⬇️
...min/cluster/snapshots/get/GetSnapshotsRequest.java	52.63% <0.00%> (-31.58%)	⬇️
...search/aggregations/pipeline/HoltWintersModel.java	21.47% <0.00%> (-30.21%)	⬇️
...opensearch/snapshots/SnapshotMissingException.java	28.57% <0.00%> (-28.58%)	⬇️
... and 460 more

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[Rishikesh1159]

apache-rat upgraded dependency from commons-lang to commons-lang3 here which was released in version 0.14. So, all apache-rat version from 0.14 and above use commons-lang3.

[opensearch-trigger-bot]

The backport to 2.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-2.x 2.x
# Navigate to the new working tree
pushd ../.worktrees/backport-2.x
# Create a new branch
git switch --create backport/backport-5675-to-2.x
# Cherry-pick the merged commit of this pull request and resolve the conflicts
git cherry-pick -x --mainline 1 274651783fed29f64e9f524da2b70a31d194667e
# Push it to GitHub
git push --set-upstream origin backport/backport-5675-to-2.x
# Go back to the original working tree
popd
# Delete the working tree
git worktree remove ../.worktrees/backport-2.x

Then, create a pull request where the base branch is 2.x and the compare/head branch is backport/backport-5675-to-2.x.