Update dependency prettier to v2.8.7

Author: renovate[bot]

package.json

@@ -54,7 +54,7 @@
     "jest": "26.6.3",
     "multer": "1.4.2",
     "npm-run-all": "4.1.5",
-    "prettier": "2.3.0",
+    "prettier": "2.8.7",
     "redux": "4.1.0",
     "redux-actions": "2.6.5"
   },