Update grafana (7.5.4 -> 7.5.5)

roles/matrix-grafana/defaults/main.yml

@@ -3,7 +3,7 @@
 
 matrix_grafana_enabled: false
 
-matrix_grafana_version: 7.5.4
+matrix_grafana_version: 7.5.5
 matrix_grafana_docker_image: "{{ matrix_container_global_registry_prefix }}grafana/grafana:{{ matrix_grafana_version }}"
 matrix_grafana_docker_image_force_pull: "{{ matrix_grafana_docker_image.endswith(':latest') }}"
 
@@ -50,5 +50,3 @@ matrix_grafana_systemd_wanted_services_list: []
 #
 # Takes an "<ip>:<port>" or "<port>" value (e.g. "127.0.0.1:3000"), or empty string to not expose.
 matrix_grafana_container_http_host_bind_port: ''
-
-