chore: upgrade eslint-plugin-node (googleapis#1918)

Author: Benjamin E. Coe

package.json

@@ -66,7 +66,7 @@
     "codecov": "^3.4.0",
     "eslint": "^6.0.0",
     "eslint-config-prettier": "^6.0.0",
-    "eslint-plugin-node": "^10.0.0",
+    "eslint-plugin-node": "^11.0.0",
     "eslint-plugin-prettier": "^3.1.0",
     "execa": "^4.0.0",
     "gts": "^1.1.0",