App Manager v1.122.0 release notes (#2899)

* App Manager v1.122.0 release notes

* Update rn-app-manager.md

* Update rn-app-manager.md

* Update rn-app-manager.md

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Co-authored-by: replicated-ci-kots <[email protected]>
Co-authored-by: Alex Parker <[email protected]>
Co-authored-by: Ethan Mosbaugh <[email protected]>

Author: 4 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-->
 
+## 1.122.0
+
+Released on December 12, 2024
+
+Support for Kubernetes: 1.29, 1.30, and 1.31
+
+### New Features {#new-features-1-122-0}
+* Adds support for [orLabelSelectors](https://docs.replicated.com/reference/custom-resource-backup#fields) to the velero.io/v1 Backup resource for [Full Snapshots](https://docs.replicated.com/vendor/snapshots-overview).
+
 ## 1.121.2
 
 Released on November 27, 2024