[AUTO] Add release notes for 3.2.0 (opensearch-project#830)

Author: opensearch-ci-bot

release-notes/opensearch-performance-analyzer.release-notes-3.2.0.0.md

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+## Version 3.2.0 Release Notes
+
+Compatible with OpenSearch and OpenSearch Dashboards version 3.2.0
+
+### Infrastructure
+* Bump gradle to 8.14, fix backport-deletion and support JDK24 ([#831](https://github.com/opensearch-project/performance-analyzer/pull/831))
+
+### Maintenance
+* Bump spotbug to 6.2.2 and checkstyle 10.26.1 ([#826](https://github.com/opensearch-project/performance-analyzer/pull/826))
+* Increment version to 3.2.0-SNAPSHOT ([#823](https://github.com/opensearch-project/performance-analyzer/pull/823))