Switch synapse-admin to tagged release (0.8.1)

Fixes https://github.com/spantaleev/matrix-docker-ansible-deploy/issues/1084

roles/matrix-synapse-admin/defaults/main.yml

@@ -8,7 +8,7 @@ matrix_synapse_admin_container_self_build_repo: "https://github.com/Awesome-Tech
 
 matrix_synapse_admin_docker_src_files_path: "{{ matrix_base_data_path }}/synapse-admin/docker-src"
 
-matrix_synapse_admin_version: latest
+matrix_synapse_admin_version: 0.8.1
 matrix_synapse_admin_docker_image: "{{ matrix_synapse_admin_docker_image_name_prefix }}awesometechnologies/synapse-admin:{{ matrix_synapse_admin_version }}"
 matrix_synapse_admin_docker_image_name_prefix: "{{ 'localhost/' if matrix_synapse_admin_container_self_build else matrix_container_global_registry_prefix }}"
 matrix_synapse_admin_docker_image_force_pull: "{{ matrix_synapse_admin_docker_image.endswith(':latest') }}"