[Forwardport] Add 2.9.1 to BWC and known versions (#8923)#8929

Merged

reta merged 1 commit intoopensearch-project:mainfrom reta:backport/backport-8923-to-main

Jul 27, 2023

+2

Commits on Jul 27, 2023

Add 2.9.1 to BWC and known versions (opensearch-project#8923 )
reta
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