Update changelog based on model updates

Author: aws-sdk-python-automation

.changes/next-release/api-change-cleanroomsml-22324.json

@@ -0,0 +1,5 @@
+{
+  "type": "api-change",
+  "category": "``cleanroomsml``",
+  "description": "AWS Clean Rooms ML now supports advanced Spark configurations to optimize SQL performance when creating an MLInputChannel or an audience generation job."
+}