Update plugin.json for Grafana 10.4.18 as dependency (#305)

Updated dependency in plugin.json to match the statement in README.

Author: godspeed-you

src/plugin.json

@@ -39,7 +39,7 @@
     "updated": "%TODAY%"
   },
   "dependencies": {
-    "grafanaDependency": ">=9.5.15",
+    "grafanaDependency": ">=10.4.18",
     "plugins": []
   },
   "routes": [