Add v5.11.0 to CHANGELOG

(cherry picked from commit 64f947f)

Author: kategengler

CHANGELOG.md

@@ -1,11 +1,6 @@
 # Ember Changelog
 
-## v5.11.0-beta.2 (August 6, 2024)
-
-- [#20726](https://github.com/emberjs/ember.js/pull/20726) [BUGFIX] Fix test waiters by removing unintentional duplication from ember-testing bundle
-- [#20715](https://github.com/emberjs/ember.js/pull/20715) [BUGFIX] Don't publish empty modules
-
-## v5.11.0-beta.1 (July 8, 2024)
+## v5.11.0 (August 19, 2024)
 
 - [#20716](https://github.com/emberjs/ember.js/pull/20716) [BREAKING] Drop Node 16 support
 - [#20704](https://github.com/emberjs/ember.js/pull/20704) Remove `Component` suffix from blueprints to facilitate <template>