build(deps): yarn upgrade

Author: alee

package.json

@@ -4,7 +4,7 @@
   "license": "CC0-1.0",
   "devDependencies": {
     "autoprefixer": "^10.2.5",
-    "postcss": "^8.0.0",
+    "postcss": "^8.4.14",
     "postcss-cli": "^8.3.1"
   },
   "browserlist": [