Update dependency prettier to v2.8.8

Author: renovate[bot]

package.json

@@ -55,7 +55,7 @@
     "eslint-plugin-qunit": "6.2.0",
     "loader.js": "4.7.0",
     "npm-run-all": "4.1.5",
-    "prettier": "2.4.1",
+    "prettier": "2.8.8",
     "qunit": "2.17.2",
     "qunit-dom": "1.6.0"
   },

yarn.lock

@@ -9692,10 +9692,10 @@ prettier-linter-helpers@^1.0.0:
   dependencies:
     fast-diff "^1.1.2"
 
-prettier@2.4.1:
-  version "2.4.1"
-  resolved "https://registry.yarnpkg.com/prettier/-/prettier-2.4.1.tgz#671e11c89c14a4cfc876ce564106c4a6726c9f5c"
-  integrity sha512-9fbDAXSBcc6Bs1mZrDYb3XKzDLm4EXXL9sC1LqKP5rZkT6KRr/rf9amVUcODVXgguK/isJz0d0hP72WeaKWsvA==
+prettier@2.8.8:
+  version "2.8.8"
+  resolved "https://registry.yarnpkg.com/prettier/-/prettier-2.8.8.tgz#e8c5d7e98a4305ffe3de2e1fc4aca1a71c28b1da"
+  integrity sha512-tdN8qQGvNjw4CHbY+XXk0JgCXn9QiF21a55rBe5LJAU+kDyC4WQn4+awm2Xfk2lQMk5fKup9XgzTZtGkjBdP9Q==
 
 printf@^0.6.1:
   version "0.6.1"