[AUTO] Increment version to 1.3.20.0

[opensearch-trigger-bot]

• Incremented version to 1.3.20.0.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 72.48%. Comparing base (f779544) to head (4325ce4).
Report is 1 commits behind head on 1.3.

Additional details and impacted files

@@           Coverage Diff           @@
##              1.3    #2147   +/-   ##
=======================================
  Coverage   72.48%   72.48%           
=======================================
  Files          88       88           
  Lines        1926     1926           
  Branches      251      251           
=======================================
  Hits         1396     1396           
  Misses        474      474           
  Partials       56       56           

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