Updated 1.3.9 release note to include latest version of Netty (#6698)

(cherry picked from commit 973ba4f)
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release-notes/opensearch.release-notes-1.3.9.md

@@ -1,7 +1,7 @@
 ## 2022-03-15 Version 1.3.9 Release Notes
 
 ### Upgrades
-- Upgrade `Netty` from 4.1.86.Final to 4.1.87.Final ([#6130](https://github.com/opensearch-project/OpenSearch/pull/6130))
+- Upgrade Netty to 4.1.90.Final ([#6677](https://github.com/opensearch-project/OpenSearch/pull/6677)
 - Upgrade `Jackson` from 2.14.1 to 2.14.2 ([#6129](https://github.com/opensearch-project/OpenSearch/pull/6129))
 - Add support for ppc64le architecture ([#5459](https://github.com/opensearch-project/OpenSearch/pull/5459))
 - Upgrade `snakeyaml` from 1.33 to 2.0 ([#6511](https://github.com/opensearch-project/OpenSearch/pull/6511))