[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 94.73%. Comparing base (95ae616) to head (7b8edcd).

Additional details and impacted files

@@           Coverage Diff           @@
##              2.x     #370   +/-   ##
=======================================
  Coverage   94.73%   94.73%           
=======================================
  Files           5        5           
  Lines         152      152           
  Branches       45       45           
=======================================
  Hits          144      144           
  Misses          8        8           

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