Update grafana toolkit

Author: aocenas

package.json

@@ -13,7 +13,7 @@
   "devDependencies": {
     "@grafana/data": "7.2.0",
     "@grafana/runtime": "7.2.0",
-    "@grafana/toolkit": "7.2.0",
+    "@grafana/toolkit": "7.3.0",
     "@grafana/ui": "7.2.0",
     "@testing-library/react": "^10.4.4",
     "@types/lodash": "latest",