Added 2.3.1 release notes (opensearch-project#2871) (opensearch-proje…

…ct#2906)

* Added 2.3.1 release notes

Signed-off-by: Asif Sohail Mohammed <nsifmoh@amazon.com>

* Updated release notes

Signed-off-by: Asif Sohail Mohammed <nsifmoh@amazon.com>

---------

Signed-off-by: Asif Sohail Mohammed <nsifmoh@amazon.com>
(cherry picked from commit c66ebfd)

Co-authored-by: Asif Sohail Mohammed <nsifmoh@amazon.com>

release/release-notes/data-prepper.release-notes-2.3.1.md

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+## 2023-06-19 Version 2.3.1
+
+---
+
+### Enhancements
+* Add support for external ID when making STS AssumeRole call ([#2862](https://github.com/opensearch-project/data-prepper/pull/2862))
+* Remove sensitive from the error log for index name format failure in OpenSearch sink ([#2894](https://github.com/opensearch-project/data-prepper/pull/2894))
+
+### Bug Fixes
+* Fix errors when SQS notifications are from AWS EventBridge ([#2861](https://github.com/opensearch-project/data-prepper/pull/2861), [#2789](https://github.com/opensearch-project/data-prepper/pull/2789), [#2788](https://github.com/opensearch-project/data-prepper/pull/2788))
+* Fix concurrentModification in CredentialsCache ([#2876](https://github.com/opensearch-project/data-prepper/pull/2876))
+* Fix suppressed exception and added logs when incorrect compression is configures in S3 source ([#2879](https://github.com/opensearch-project/data-prepper/pull/2879), [#2896](https://github.com/opensearch-project/data-prepper/pull/2896))
+* Fix S3 sink metrics names as they are conflicting with S3 source ([#2887](https://github.com/opensearch-project/data-prepper/pull/2887))
+* Fix silent dropping data when index has null keys ([#2885](https://github.com/opensearch-project/data-prepper/pull/2885))
+
+### Security
+* Fix CVE-2017-1000487, CVE-2022-4244, CVE-2022-4245 ([#2848](https://github.com/opensearch-project/data-prepper/pull/2848))