fix: Enforces namespace for json-message.

modules/xmpp/ChatRoom.js

             }
         }
 
-        const jsonMessage = $(msg).find('>json-message').text();
+        const jsonMessage = $(msg).find('>json-message[xmlns="http://jitsi.org/jitmeet"]').text();
 
         if (jsonMessage) {
             const parsedJson = this.xmpp.tryParseJSONAndVerify(jsonMessage);

modules/xmpp/xmpp.js

             return true;
         }
 
-        const jsonMessage = $(msg).find('>json-message')
+        const jsonMessage = $(msg).find('>json-message[xmlns="http://jitsi.org/jitmeet"]')
             .text();
         const parsedJson = this.tryParseJSONAndVerify(jsonMessage);