Update Test & linting packages

Author: renovate-bot

package.json

@@ -62,10 +62,10 @@
   },
   "devDependencies": {
     "@tryghost/deploy": "0.3.1",
-    "eslint": "7.25.0",
-    "eslint-plugin-ghost": "2.1.0",
+    "eslint": "7.26.0",
+    "eslint-plugin-ghost": "2.2.0",
     "istanbul": "0.4.5",
-    "mocha": "8.3.2",
+    "mocha": "8.4.0",
     "nodemon": "2.0.7",
     "rewire": "5.0.0",
     "should": "13.2.3",