Upgrade matrix-corporal (2.1.4 -> 2.2.0)

There was also a 2.1.5 security release made today.
2.2.0 contains the same security fix + more.

Both make handling of Client-Server API v3-prefixed requests better.

Related to #1404

roles/matrix-corporal/defaults/main.yml

@@ -22,7 +22,7 @@ matrix_corporal_container_extra_arguments: []
 # List of systemd services that matrix-corporal.service depends on
 matrix_corporal_systemd_required_services_list: ['docker.service']
 
-matrix_corporal_version: 2.1.4
+matrix_corporal_version: 2.2.0
 matrix_corporal_docker_image: "{{ matrix_corporal_docker_image_name_prefix }}devture/matrix-corporal:{{ matrix_corporal_docker_image_tag }}"
 matrix_corporal_docker_image_name_prefix: "{{ 'localhost/' if matrix_corporal_container_image_self_build else matrix_container_global_registry_prefix }}"
 matrix_corporal_docker_image_tag: "{{ matrix_corporal_version }}" # for backward-compatibility