changelog: adds note about closing #9735

CHANGELOG.md

 # 5.4.0 (unreleased)
 
+### New Features
+
+* **Annotations**: Enable template variables in tagged annotations queries [#9735](https://github.com/grafana/grafana/issues/9735)
+
 ### Minor
 
 * **OAuth**: Allow oauth email attribute name to be configurable [#12986](https://github.com/grafana/grafana/issues/12986), thx [@bobmshannon](https://github.com/bobmshannon)