Update release notes for 1.3.20 (#9017)

Signed-off-by: Suchit Sahoo <[email protected]>

Author: LDrago27

CHANGELOG.md

@@ -1,14 +1,17 @@
 # CHANGELOG
 Inspired from [Keep a Changelog](https://keepachangelog.com/en/1.0.0/)
 
-## [Unreleased](https://github.com/opensearch-project/OpenSearch-Dashboards/compare/1.3.19...1.3)
+## [1.3.20 - 2024-12-06](https://github.com/opensearch-project/OpenSearch-Dashboards/releases/tag/1.3.20)
 
 ### 💥 Breaking Changes
 
 ### Deprecations
 
 ### 🛡   Security
 
+- [CVE-2024-45590] Bump body-parser from 1.19.0 to 1.20.3 ([#9007](https://github.com/opensearch-project/OpenSearch-Dashboards/pull/9007))
+- [CVE-2024-45296] Bump various version of path-to-regexp to required versions ([#9007](https://github.com/opensearch-project/OpenSearch-Dashboards/pull/9007))
+
 ### 📈 Features/Enhancements
 
 ### 🐛 Bug Fixes

release-notes/opensearch-dashboards.release-notes-1.3.20.md

@@ -0,0 +1,17 @@
+# Version 1.3.19 Release Notes
+
+### 🛡 Security
+
+- [CVE-2024-45590] Bump body-parser from 1.19.0 to 1.20.3 ([#9007](https://github.com/opensearch-project/OpenSearch-Dashboards/pull/9007))
+- [CVE-2024-45296] Bump various version of path-to-regexp to required versions ([#9007](https://github.com/opensearch-project/OpenSearch-Dashboards/pull/9007))
+
+### 📈 Features/Enhancements
+
+### 🐛 Bug Fixes
+
+### 🚞 Infrastructure
+
+### 📝 Documentation
+
+### 🛠  Maintenance
+