add trailing empty line (for linter)

Author: puckpuck

src/grafana/provisioning/dashboards/demo/apm-dashboard.json

@@ -2137,4 +2137,4 @@
   "title": "APM Dashboard (Jaeger, Prometheus, OpenSearch)",
   "uid": "febljk0a32qyoa",
   "version": 1
-}
+}

src/grafana/provisioning/dashboards/demo/demo-dashboard.json

@@ -1184,4 +1184,4 @@
   "uid": "W2gX2zHVk",
   "version": 2,
   "weekStart": ""
-}
+}

src/grafana/provisioning/dashboards/demo/exemplars-dashboard.json

@@ -456,4 +456,4 @@
   "title": "Cart Service Exemplars",
   "uid": "ce6sd46kfkglca",
   "version": 1
-}
+}

src/grafana/provisioning/dashboards/demo/linux-dashboard.json

@@ -2826,4 +2826,4 @@
   "title": "Linux",
   "uid": "otel-demo-hostmetrics",
   "version": 1
-}
+}

src/grafana/provisioning/dashboards/demo/postgresql-dashboard.json

@@ -1471,4 +1471,4 @@
   "title": "PostgreSQL",
   "uid": "xHhbQmdjA",
   "version": 5
-}
+}

src/grafana/provisioning/dashboards/demo/spanmetrics-dashboard.json

@@ -1031,4 +1031,4 @@
   "uid": "W2gX2zHVk48",
   "version": 2,
   "weekStart": ""
-}
+}