Update dependency eslint-plugin-ghost to v2.15.1

Author: renovate[bot]

package.json

@@ -44,6 +44,6 @@
   },
   "devDependencies": {
     "eslint": "7.32.0",
-    "eslint-plugin-ghost": "2.11.0"
+    "eslint-plugin-ghost": "2.15.1"
   }
 }