chore: Update jitsi-xmpp-extensions. (#2271)

Author: bgrozev

pom.xml

@@ -121,7 +121,7 @@
             <dependency>
                 <groupId>${project.groupId}</groupId>
                 <artifactId>jitsi-xmpp-extensions</artifactId>
-                <version>1.0-81-g3816e5a</version>
+                <version>1.0-84-g4675450</version>
             </dependency>
         </dependencies>
     </dependencyManagement>