Updating Kotlin version

[sejli]

Signed-off-by: sejli [email protected]

Description

Updating Kotlin version for opensearch-observability to 1.6.0

Issues Resolved

Check List

• New functionality includes testing.
  • All tests pass, including unit test, integration test and doctest
• New functionality has been documented.
  • New functionality has javadoc added
  • New functionality has user manual doc added
• 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.
For more information on following Developer Certificate of Origin and signing off your commits, please check here.

[codecov-commenter]

Codecov Report

Merging #1052 (fdd5e40) into 1.x (28e5b38) will increase coverage by 1.22%.
The diff coverage is 100.00%.

@@             Coverage Diff              @@
##                1.x    #1052      +/-   ##
============================================
+ Coverage     53.64%   54.87%   +1.22%     
- Complexity      271      283      +12     
============================================
  Files           244      244              
  Lines          7728     7747      +19     
  Branches       1559     1551       -8     
============================================
+ Hits           4146     4251     +105     
+ Misses         3391     3326      -65     
+ Partials        191      170      -21     

Flag	Coverage Δ
dashboards-observability	46.51% <ø> (ø)
opensearch-observability	76.56% <100.00%> (+4.23%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
...pensearch/observability/settings/PluginSettings.kt	74.71% <100.00%> (+0.72%)	⬆️
...ensearch/observability/index/ObservabilityIndex.kt	57.48% <0.00%> (-5.62%)	⬇️
...search/observability/security/UserAccessManager.kt	7.24% <0.00%> (-2.76%)	⬇️
...ability/model/ObservabilityObjectDataProperties.kt	62.06% <0.00%> (-1.27%)	⬇️
.../org/opensearch/observability/model/Application.kt	4.68% <0.00%> (-0.08%)	⬇️
...tlin/org/opensearch/observability/model/RestTag.kt	100.00% <0.00%> (ø)
...rg/opensearch/observability/ObservabilityPlugin.kt	100.00% <0.00%> (ø)
...pensearch/observability/action/PluginBaseAction.kt	30.00% <0.00%> (ø)
...pensearch/observability/security/SecurityAccess.kt	0.00% <0.00%> (ø)
...rvability/action/GetObservabilityObjectResponse.kt	100.00% <0.00%> (ø)
... and 25 more

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[kavithacm]

minor change