Amazon Bedrock Runtime Update: Add support for system tool and web citation response.

Author: AWS

.changes/next-release/feature-AmazonBedrockRuntime-bcc8f4d.json

@@ -0,0 +1,6 @@
+{
+    "type": "feature",
+    "category": "Amazon Bedrock Runtime",
+    "contributor": "",
+    "description": "Add support for system tool and web citation response."
+}