App Manager v1.126.0 release notes (#3451)

* App Manager v1.126.0 release notes

* Update rn-app-manager.md

---------

Co-authored-by: replicated-ci-kots <91219917+replicated-ci-kots@users.noreply.github.com>
Co-authored-by: Salah Al Saleh <sg.alsaleh@gmail.com>

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-->
 
+## 1.126.0
+
+Released on August 15, 2025
+
+Support for Kubernetes: 1.31, 1.32, and 1.33
+
+### New Features {#new-features-1-126-0}
+* When checking for application updates, KOTS now tries to automatically refresh the metadata (version labels, release notes, and required status) for pending releases that belong to the same channel of the currently deployed version.
+
 ## 1.125.2
 
 Released on August 5, 2025