Update dependency prettier to v2.8.0 (#5525)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

package.json

@@ -128,7 +128,7 @@
     "nyc": "15.1.0",
     "postcss-custom-media": "8.0.2",
     "postcss-nested": "6.0.0",
-    "prettier": "2.7.1",
+    "prettier": "2.8.0",
     "qunit": "2.19.3",
     "qunit-console-grouper": "0.3.0",
     "qunit-dom": "2.0.0",