Update dependency eslint-plugin-ghost to v3

Author: renovate[bot]

package.json

@@ -16,7 +16,7 @@
   "devDependencies": {
     "bunyan": "1.8.15",
     "eslint": "7.21.0",
-    "eslint-plugin-ghost": "2.0.0",
+    "eslint-plugin-ghost": "3.3.0",
     "mkdirp": "1.0.4",
     "mocha": "8.3.0",
     "should": "13.2.3",