chore: pin eslint-plugin

Author: Marsup

package.json

@@ -26,7 +26,7 @@
   },
   "devDependencies": {
     "@hapi/code": "^9.0.3",
-    "@hapi/eslint-plugin": "*",
+    "@hapi/eslint-plugin": "^6.0.0",
     "@hapi/lab": "^25.0.1",
     "@hapi/teamwork": "^6.0.0",
     "@hapi/wreck": "^18.0.0",