Revert "Update Jitsi stable-7577-2 -> stable-7648"

This reverts commit 2c01c5bedf.

Fixes https://github.com/spantaleev/matrix-docker-ansible-deploy/issues/2025

Related to https://github.com/jitsi/jitsi-meet/issues/12026

roles/matrix-jitsi/defaults/main.yml

@@ -71,7 +71,7 @@ matrix_jitsi_jibri_recorder_password: ''
 
 matrix_jitsi_enable_lobby: false
 
-matrix_jitsi_version: stable-7648
+matrix_jitsi_version: stable-7577-2
 matrix_jitsi_container_image_tag: "{{ matrix_jitsi_version }}"  # for backward-compatibility
 
 matrix_jitsi_web_docker_image: "{{ matrix_container_global_registry_prefix }}jitsi/web:{{ matrix_jitsi_container_image_tag }}"