Add v6.9.0-beta.3 to CHANGELOG for ember-source

(cherry picked from commit 48364f4)

Author: kategengler

CHANGELOG.md

@@ -1,5 +1,9 @@
 # Ember Changelog
 
+## v6.9.0-beta.3 (November 11, 2025)
+
+- [#21002](https://github.com/emberjs/ember.js/pull/21002) [BUGFIX] Don't render if we're mid-destroy
+
 ## v6.9.0-beta.2 (October 30, 2025)
 
 - [#20994](https://github.com/emberjs/ember.js/pull/20994) [BUGFIX] Fix loose-mode components invoked from a strict mode component via renderComponent