Add grafanaVersion

Author: marcusolsson

src/plugin.json

@@ -42,7 +42,7 @@
   },
   "dependencies": {
     "grafanaDependency": ">=7.3.0",
-    "grafanaVersion": "7.3.x",
+    "grafanaVersion": "7.3.0",
     "plugins": []
   }
 }