Bump aws-sdk version to 1.12.797

[KashKondaka]

Bump aws_version to 1.12.797 in notifications/build.gradle.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 66.85%. Comparing base (ccdc45b) to head (2434e80).

Additional details and impacted files

@@            Coverage Diff            @@
##               2.19    #1199   +/-   ##
=========================================
  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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