Update Test & linting packages

Author: renovate-bot

package.json

@@ -60,14 +60,14 @@
     "validator": "13.0.0"
   },
   "devDependencies": {
-    "eslint": "7.25.0",
-    "eslint-plugin-ghost": "2.1.0",
+    "eslint": "7.28.0",
+    "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",
-    "sinon": "11.0.0"
+    "sinon": "11.1.1"
   },
   "files": [
     "lib",