[AUTO] Increment version to 1.3.20.0

[opensearch-trigger-bot]

• Incremented version to 1.3.20.0.

[peterzhuamazon]

Pending: #405

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.30%. Comparing base (d6844b3) to head (ce5ad10).
Report is 1 commits behind head on 1.3.

Additional details and impacted files

@@           Coverage Diff           @@
##              1.3     #402   +/-   ##
=======================================
  Coverage   95.30%   95.30%           
=======================================
  Files           5        5           
  Lines         149      149           
  Branches       45       45           
=======================================
  Hits          142      142           
  Misses          7        7           

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