Update Grafana 7.3.7 => 7.4.0

roles/matrix-grafana/defaults/main.yml

@@ -3,7 +3,7 @@
 
 matrix_grafana_enabled: false
 
-matrix_grafana_docker_image: "docker.io/grafana/grafana:7.3.7"
+matrix_grafana_docker_image: "docker.io/grafana/grafana:7.4.0"
 matrix_grafana_docker_image_force_pull: "{{ matrix_grafana_docker_image.endswith(':latest') }}"
 
 # Not conditional, because when someone disables metrics
@@ -12,7 +12,7 @@ matrix_grafana_docker_image_force_pull: "{{ matrix_grafana_docker_image.endswith
 matrix_grafana_dashboard_download_urls:
 - "https://raw.githubusercontent.com/matrix-org/synapse/master/contrib/grafana/synapse.json"
 - "https://raw.githubusercontent.com/rfrail3/grafana-dashboards/master/prometheus/node-exporter-full.json"
-  
+
 matrix_grafana_base_path: "{{ matrix_base_data_path }}/grafana"
 matrix_grafana_config_path: "{{ matrix_grafana_base_path }}/config"
 matrix_grafana_data_path: "{{ matrix_grafana_base_path }}/data"