chore(deps): update dependency prettier to v2.8.8

Author: renovate[bot]

package.json

@@ -53,7 +53,7 @@
     "eslint-plugin-promise": "4.2.1",
     "eslint-plugin-standard": "4.1.0",
     "mocha": "8.2.1",
-    "prettier": "2.2.1",
+    "prettier": "2.8.8",
     "prettier-config-standard": "1.0.1",
     "rollup": "2.37.1",
     "vinyl": "2.2.1"