Update dependency prettier to v2.8.7

Author: renovate[bot]

package.json

@@ -83,7 +83,7 @@
     "postcss-loader": "3.0.0",
     "postcss-preset-env": "6.7.0",
     "precss": "4.0.0",
-    "prettier": "2.0.5",
+    "prettier": "2.8.7",
     "promise-polyfill": "8.1.3",
     "sass-loader": "8.0.2",
     "style-loader": "1.2.1",