chore(deps): update dependency eslint-plugin-node to v9 (#390)

Author: renovate[bot]

handwritten/datastore/package.json

@@ -75,7 +75,7 @@
     "codecov": "^3.0.2",
     "eslint": "^5.0.0",
     "eslint-config-prettier": "^4.0.0",
-    "eslint-plugin-node": "^8.0.0",
+    "eslint-plugin-node": "^9.0.0",
     "eslint-plugin-prettier": "^3.0.0",
     "google-proto-files": "^0.20.0",
     "gts": "^0.9.0",