App Manager v1.125.1 release notes (#3411)

* App Manager v1.125.1 release notes

* update kots release note

---------

Co-authored-by: replicated-ci-kots <[email protected]>
Co-authored-by: Diamon Wiggins <[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-->
 
+## 1.125.1
+
+Released on July 31, 2025
+
+Support for Kubernetes: 1.31, 1.32, and 1.33
+
+### Improvements {#improvements-1-125-1}
+* Updates Troubleshoot to v0.121.2
+
 ## 1.125.0
 
 Released on July 23, 2025