App Manager v1.124.3 release notes (#3035)

* App Manager v1.124.3 release notes

* Update rn-app-manager.md

---------

Co-authored-by: replicated-ci-kots <[email protected]>
Co-authored-by: Salah Al Saleh <[email protected]>

Author: 3 people

docs/release-notes/rn-app-manager.md

@@ -18,6 +18,15 @@ The following table lists the versions of Kubernetes that are compatible with ea
 
 <!--RELEASE_NOTES_PLACEHOLDER-->
 
+## 1.124.3
+
+Released on February 5, 2025
+
+Support for Kubernetes: 1.29, 1.30, and 1.31
+
+### Improvements {#improvements-1-124-3}
+* Updates images to resolve CVE-2024-45337 with critical severity and CVE-2024-45338 with high severity.
+
 ## 1.124.2
 
 Released on February 4, 2025