Enable MSC4143 for MatrixRTC deployments

Fixes https://github.com/spantaleev/matrix-docker-ansible-deploy/issues/5066

group_vars/matrix_servers

@@ -4909,6 +4909,8 @@ matrix_synapse_experimental_features_msc4108_enabled: "{{ matrix_authentication_
 
 matrix_synapse_experimental_features_msc4140_enabled: "{{ matrix_rtc_enabled }}"
 
+matrix_synapse_experimental_features_msc4143_enabled: "{{ matrix_rtc_enabled }}"
+
 matrix_synapse_experimental_features_msc4222_enabled: "{{ matrix_rtc_enabled }}"
 
 # Disable password authentication when delegating authentication to Matrix Authentication Service.