Incremented version to 1.2.3.

[dblock]

Coming from opensearch-project/opensearch-build#1365.

[codecov-commenter]

Codecov Report

❗ No coverage uploaded for pull request base (1.2@0300241). Click here to learn what that means.
The diff coverage is n/a.

@@          Coverage Diff           @@
##             1.2      #84   +/-   ##
======================================
  Coverage       ?   83.52%           
  Complexity     ?      556           
======================================
  Files          ?       61           
  Lines          ?     2058           
  Branches       ?      146           
======================================
  Hits           ?     1719           
  Misses         ?      232           
  Partials       ?      107           

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