App Manager v1.124.5 release notes (#3105)

* App Manager v1.124.5 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-->
 
+## 1.124.5
+
+Released on March 11, 2025
+
+Support for Kubernetes: 1.29, 1.30, and 1.31
+
+### Bug Fixes {#bug-fixes-1-124-5}
+* Fixes SBOM generation and signing issue. A properly signed SBOM is now included in the release artifacts.
+
 ## 1.124.4
 
 Released on February 14, 2025