Update dependency prettier to v2.8.4

Author: renovate[bot]

package.json

@@ -71,7 +71,7 @@
     "eslint-plugin-qunit": "6.2.0",
     "loader.js": "4.7.0",
     "npm-run-all": "4.1.5",
-    "prettier": "2.7.1",
+    "prettier": "2.8.4",
     "qunit": "2.19.4",
     "qunit-dom": "2.0.0",
     "release-it": "15.6.0",

yarn.lock

@@ -9692,10 +9692,10 @@ prettier-linter-helpers@^1.0.0:
   dependencies:
     fast-diff "^1.1.2"
 
-prettier@2.7.1, prettier@^2.5.1:
-  version "2.7.1"
-  resolved "https://registry.yarnpkg.com/prettier/-/prettier-2.7.1.tgz#e235806850d057f97bb08368a4f7d899f7760c64"
-  integrity sha512-ujppO+MkdPqoVINuDFDRLClm7D78qbDt0/NR+wp5FqEZOoTNAjPHWj17QRhu7geIHJfcNhRk1XVQmF8Bp3ye+g==
+prettier@2.8.4, prettier@^2.5.1:
+  version "2.8.4"
+  resolved "https://registry.yarnpkg.com/prettier/-/prettier-2.8.4.tgz#34dd2595629bfbb79d344ac4a91ff948694463c3"
+  integrity sha512-vIS4Rlc2FNh0BySk3Wkd6xmwxB0FpOndW5fisM5H8hsZSxU2VWVB5CWIkIjWvrHjIhxk2g3bfMKM87zNTrZddw==
 
 printf@^0.6.1:
   version "0.6.1"