Revert "Update jitsi web to stable-5142"

This reverts commit 078592454c
due to reports of breakage both in the support chat room
and in here https://github.com/spantaleev/matrix-docker-ansible-deploy/pull/719

roles/matrix-jitsi/defaults/main.yml

@@ -51,7 +51,7 @@ matrix_jitsi_jibri_recorder_password: ''
 
 matrix_jitsi_enable_lobby: false
 
-matrix_jitsi_container_image_tag: "stable-5142"
+matrix_jitsi_container_image_tag: "stable-4857"
 
 matrix_jitsi_web_docker_image: "docker.io/jitsi/web:{{ matrix_jitsi_container_image_tag }}"
 matrix_jitsi_web_docker_image_force_pull: "{{ matrix_jitsi_web_docker_image.endswith(':latest') }}"