chore: Update jitsi-xmpp-extensions.

Changes:
* Bump junit from 4.11 to 4.13.1
* fix: Adds custom nick implementation to escape the text content.
* feat: Adds new property to ConferenceProperties.
* Added mute iq for video
* feat: Add a meeting-id field to ColibriConferenceIQ. (jitsi#38)
* feat: Add an "injected" flag to SourcePacketExtension. (jitsi#39)

pom.xml

@@ -109,7 +109,7 @@
             <dependency>
                 <groupId>${project.groupId}</groupId>
                 <artifactId>jitsi-xmpp-extensions</artifactId>
-                <version>1.0-15-g813e4c4</version>
+                <version>1.0-21-g3651d97</version>
             </dependency>
             <dependency>
                 <groupId>${project.groupId}</groupId>