[AUTO] Increment version to 2.15.0.0

[opensearch-trigger-bot]

• Incremented version to 2.15.0.0.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 69.60%. Comparing base (daadf78) to head (c96b442).

Additional details and impacted files

@@           Coverage Diff           @@
##              2.x    #1982   +/-   ##
=======================================
  Coverage   69.60%   69.60%           
=======================================
  Files          95       95           
  Lines        2461     2461           
  Branches      332      332           
=======================================
  Hits         1713     1713           
  Misses        666      666           
  Partials       82       82           

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