bump up the version to 2.13

[riysaxen-amzn]

Description

• Bumping up the opensearch version to 2.13

Issues Resolved

[List any issues this PR will resolve]

Check List

• Commits are signed per the DCO using --signoff

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 66.85%. Comparing base (6a1618b) to head (e32b24d).

Additional details and impacted files

@@            Coverage Diff            @@
##                2.x     #873   +/-   ##
=========================================
  Coverage     66.85%   66.85%           
  Complexity      263      263           
=========================================
  Files            39       39           
  Lines          1738     1738           
  Branches        165      165           
=========================================
  Hits           1162     1162           
  Misses          453      453           
  Partials        123      123           

Flag	Coverage Δ
opensearch-notifications	66.85% <ø> (ø)

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