Update 2.1 release version

[sruti1312]

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Update 2.1 release version

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• New functionality includes testing.
  • All tests pass
• New functionality has been documented.
  • New functionality has javadoc added
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[sruti1312]

This error will be resolved after PA changes are merged in.

> Could not resolve all files for configuration ':runtimeClasspath'.
   > Could not resolve org.opensearch:performanceanalyzer-rca:2.0.1.0-SNAPSHOT.
     Required by:
         project :
      > Could not resolve org.opensearch:performanceanalyzer-rca:2.0.1.0-SNAPSHOT.
         > Could not get resource 'https://plugins.gradle.org/m2/org/opensearch/performanceanalyzer-rca/2.0.1.0-SNAPSHOT/performanceanalyzer-rca-2.0.1.0-SNAPSHOT.pom'.
            > Could not GET 'https://repo.gradle.org/artifactory/jcenter/org/opensearch/performanceanalyzer-rca/2.0.1.0-SNAPSHOT/performanceanalyzer-rca-2.0.1.0-SNAPSHOT.pom'. Received status code [40](https://github.com/opensearch-project/performance-analyzer-rca/runs/7048330842?check_suite_focus=true#step:11:41)9 from server: Conflict