chore: bump downstream packages to use latest AssistantAvatar (#3476)

Author: stephl3

.changeset/thin-towns-teach.md

@@ -0,0 +1,10 @@
+---
+'@lg-chat/chat-button': patch
+'@lg-chat/chat-layout': patch
+'@lg-chat/input-bar': patch
+'@lg-chat/message': patch
+'@leafygreen-ui/drawer': patch
+'@leafygreen-ui/toolbar': patch
+---
+
+[LG-5920](https://jira.mongodb.org/browse/LG-5920): Update to latest `AssistantAvatar` from `@leafygreen-ui/avatar`