[Backport 1.3] Adds 1.3.2 release notes

[opensearch-trigger-bot]

Backport b9ff31e from #1534

[codecov-commenter]

Codecov Report

❗ No coverage uploaded for pull request base (1.3@7864e3a). Click here to learn what that means.
The diff coverage is n/a.

❗ Current head b9ff31e differs from pull request most recent head 7f779db. Consider uploading reports for the commit 7f779db to get more accurate results

@@          Coverage Diff           @@
##             1.3    #1536   +/-   ##
======================================
  Coverage       ?   68.09%           
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  Files          ?     3072           
  Lines          ?    59032           
  Branches       ?     8928           
======================================
  Hits           ?    40198           
  Misses         ?    16647           
  Partials       ?     2187           

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