Add v5.11.1 to CHANGELOG for ember-source

(cherry picked from commit a106367)

Author: kategengler

CHANGELOG.md

@@ -12,6 +12,10 @@
 
 - [#20714](https://github.com/emberjs/ember.js/pull/20714) [BUGFIX] Break eager cycle for "deprecate" function
 
+## v5.11.1 (September 23, 2024)
+
+- [#20734](https://github.com/emberjs/ember.js/pull/20734) Circularity fixes
+
 ## v5.11.0 (August 19, 2024)
 
 - [#20716](https://github.com/emberjs/ember.js/pull/20716) [BREAKING] Drop Node 16 support