Update dependency prettier to v2.8.8

Author: renovate[bot]

flink-runtime-web/web-dashboard/package.json

@@ -70,7 +70,7 @@
     "karma-jasmine-html-reporter": "2.1.0",
     "lint-staged": "15.0.0",
     "postcss-less": "^6.0.0",
-    "prettier": "3.0.0",
+    "prettier": "2.8.8",
     "protractor": "~7.0.0",
     "stylelint": "14.16.1",
     "stylelint-config-hudochenkov": "10.0.0",