[Backport 3.2] Update commonslang to use 3.18.0

[opensearch-trigger-bot]

Backport 696ed65 from #18955.

[github-actions]

❌ Gradle check result for 8e2e319: FAILURE

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 result for 8e2e319: UNSTABLE

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 72.85%. Comparing base (5cddeb8) to head (8e2e319).
⚠️ Report is 2 commits behind head on 3.2.

Additional details and impacted files

@@             Coverage Diff              @@
##                3.2   #18961      +/-   ##
============================================
- Coverage     72.90%   72.85%   -0.06%     
+ Complexity    69349    69286      -63     
============================================
  Files          5642     5642              
  Lines        318636   318636              
  Branches      46107    46107              
============================================
- Hits         232306   232135     -171     
- Misses        67484    67722     +238     
+ Partials      18846    18779      -67     

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[prudhvigodithi]

I will create a new PR with updated changelog.