Use Jitsi STUN servers instead of Google ones

These are some new defaults that we switch to, to follow upstream
changes:

- https://github.com/jitsi/docker-jitsi-meet/commit/264df04
- 3121494d4b

group_vars/matrix_servers

@@ -416,7 +416,7 @@ matrix_jitsi_web_stun_servers: |
       matrix_server_fqn_matrix + ':3478',
     ]
     if matrix_coturn_enabled
-    else [ 'stun.l.google.com:19302', 'stun1.l.google.com:19302', 'stun2.l.google.com:19302']
+    else [ 'meet-jit-si-turnrelay.jitsi.net:443']
   }}
 
 ######################################################################

roles/matrix-jitsi/defaults/main.yml

@@ -38,7 +38,7 @@ matrix_jitsi_web_transcripts_path: "{{ matrix_jitsi_web_base_path }}/transcripts
 matrix_jitsi_web_public_url: "https://{{ matrix_server_fqn_jitsi }}"
 
 # STUN servers used in the web UI. Feel free to point them to your own STUN server.
-matrix_jitsi_web_stun_servers: ['stun.l.google.com:19302', 'stun1.l.google.com:19302', 'stun2.l.google.com:19302']
+matrix_jitsi_web_stun_servers: ['meet-jit-si-turnrelay.jitsi.net:443']
 
 # Controls whether the matrix-jitsi-web container exposes its HTTP port (tcp/80 in the container).
 #
@@ -120,7 +120,7 @@ matrix_jitsi_jvb_auth_password: ''
 
 # STUN servers used by JVB on the server-side, so it can discover its own external IP address.
 # Pointing this to a STUN server running on the same Docker network may lead to incorrect IP address discovery.
-matrix_jitsi_jvb_stun_servers: ['stun.l.google.com:19302', 'stun1.l.google.com:19302', 'stun2.l.google.com:19302']
+matrix_jitsi_jvb_stun_servers: ['meet-jit-si-turnrelay.jitsi.net:443']
 
 matrix_jitsi_jvb_brewery_muc: jvbbrewery
 matrix_jitsi_jvb_rtp_udp_port: 10000