Downgrade synapse-admin (0.9.1 -> 0.8.7)

0.9.x is broken: https://github.com/Awesome-Technologies/synapse-admin/issues/468

A fix for this major regression got merged 2 hours after 0.9.1 was tagged,
but one week later there's still no 0.9.2. Shame.

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

@@ -12,7 +12,7 @@ matrix_synapse_admin_container_image_self_build: false
 matrix_synapse_admin_container_image_self_build_repo: "https://github.com/Awesome-Technologies/synapse-admin.git"
 
 # renovate: datasource=docker depName=awesometechnologies/synapse-admin
-matrix_synapse_admin_version: 0.9.1
+matrix_synapse_admin_version: 0.8.7
 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_image_self_build else matrix_container_global_registry_prefix }}"
 matrix_synapse_admin_docker_image_force_pull: "{{ matrix_synapse_admin_docker_image.endswith(':latest') }}"