Update CHANGELOG.md

CHANGELOG.md

@@ -26,6 +26,7 @@
 * **Postgres**: Escape ssl mode parameter in connectionstring [#12644](https://github.com/grafana/grafana/issues/12644), thx [@yogyrahmawan](https://github.com/yogyrahmawan)
 * **Github OAuth**: Allow changes of user info at Github to be synched to Grafana when signing in [#11818](https://github.com/grafana/grafana/issues/11818), thx [@rwaweber](https://github.com/rwaweber)
 * **Alerting**: Fix diff and percent_diff reducers [#11563](https://github.com/grafana/grafana/issues/11563), thx [@jessetane](https://github.com/jessetane)
+* **Alerting**: Fix rendering timeout which could cause notifications to not be sent due to rendering timing out [#12151](https://github.com/grafana/grafana/issues/12151)
 * **Units**: Polish złoty currency [#12691](https://github.com/grafana/grafana/pull/12691), thx [@mwegrzynek](https://github.com/mwegrzynek)
 * **Cloudwatch**: Improved error handling [#12489](https://github.com/grafana/grafana/issues/12489), thx [@mtanda](https://github.com/mtanda)
 * **Cloudwatch**: AppSync metrics and dimensions [#12300](https://github.com/grafana/grafana/issues/12300), thx [@franciscocpg](https://github.com/franciscocpg)