add changelog entry

Author: rlazo

ai-logic/firebase-ai/CHANGELOG.md

@@ -3,6 +3,8 @@
 - [feature] Added support for [Maps Grounding](https://ai.google.dev/gemini-api/docs/maps-grounding) (#7950)
 - [fixed] Fixed an issue causing network timeouts to throw the incorrect exception type, instead of
   `RequestTimeoutException` (#7966)
+- [fixed] Fixed an issue causing the SDK to throw an exception if an unknown message was received
+  from the LiveAPI model, instead of ignoring it (#7975)
 
 # 17.10.1