Updates ISM to 1.2 tag in manifest

[downsrob]

Signed-off-by: Robert Downs downsrob@amazon.com

Description

Release for Index Management was created for 1.2 and tag was set to 1.2.0.0: https://github.com/opensearch-project/index-management/releases/tag/1.2.0.0

Issues Resolved

opensearch-project/index-management#154

Check List

• Commits are signed per the DCO using --signoff

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.
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[codecov-commenter]

Codecov Report

Merging #1141 (c304344) into main (c0490fb) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##               main    #1141   +/-   ##
=========================================
  Coverage     93.49%   93.49%           
  Complexity       10       10           
=========================================
  Files           100      100           
  Lines          2551     2551           
  Branches          7        7           
=========================================
  Hits           2385     2385           
  Misses          158      158           
  Partials          8        8           

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