Prepare changelog for v1.11.15-rc.1

Author: RiotRobot

CHANGELOG.md

@@ -27,7 +27,9 @@ Changes in [1.11.15-rc.1](https://github.com/vector-im/element-desktop/releases/
  * Fix TimelineReset handling when no room associated ([\#9553](https://github.com/matrix-org/matrix-react-sdk/pull/9553)).
  * Always use current profile on thread events ([\#9524](https://github.com/matrix-org/matrix-react-sdk/pull/9524)). Fixes vector-im/element-web#23648.
  * Fix `ThreadView` tests not using thread flag ([\#9547](https://github.com/matrix-org/matrix-react-sdk/pull/9547)).
+ * Fix regressions around media uploads failing and causing soft crashes ([\#9549](https://github.com/matrix-org/matrix-react-sdk/pull/9549)). Fixes matrix-org/element-web-rageshakes#16831, matrix-org/element-web-rageshakes#16824 matrix-org/element-web-rageshakes#16810 and vector-im/element-web#23641.
  * Handle deletion of `m.call` events ([\#9540](https://github.com/matrix-org/matrix-react-sdk/pull/9540)). Fixes vector-im/element-web#23663.
+ * Fix /myroomavatar slash command ([\#9536](https://github.com/matrix-org/matrix-react-sdk/pull/9536)). Fixes matrix-org/synapse#14321.
  * Fix incorrect notification count after leaving a room with notifications ([\#9518](https://github.com/matrix-org/matrix-react-sdk/pull/9518)). Contributed by @Arnei.
 
 Changes in [1.11.14](https://github.com/vector-im/element-desktop/releases/tag/v1.11.14) (2022-11-08)