Bump postcss from 7.0.39 to 8.5.3 (#86)

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examples/tailwindcss/package.json

@@ -8,7 +8,7 @@
     "@types/react": "^17.0.0",
     "@types/react-dom": "^17.0.0",
     "autoprefixer": "^9",
-    "postcss": "^7",
+    "postcss": "^8",
     "react": "^17.0.2",
     "react-dialog-async": "1.0.2",
     "react-dom": "^17.0.2",