chore(deps-dev): bump postcss from 8.4.24 to 8.5.23 in /playground/vue3 (#2847)

Bumps [postcss](https://github.com/postcss/postcss) from 8.4.24 to 8.5.23.
- [Release notes](https://github.com/postcss/postcss/releases)
- [Changelog](https://github.com/postcss/postcss/blob/main/CHANGELOG.md)
- [Commits](postcss/postcss@8.4.24...8.5.23)

---
updated-dependencies:
- dependency-name: postcss
  dependency-version: 8.5.23
  dependency-type: direct:development
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

playground/vue3/package.json

@@ -20,7 +20,7 @@
     "@rollup/plugin-alias": "^5.1.1",
     "@vitejs/plugin-vue": "^5.1.4",
     "autoprefixer": "^10.4.20",
-    "postcss": "^8.5.18",
+    "postcss": "^8.5.23",
     "tailwindcss": "^3.4.17",
     "unplugin-vue-components": "^29.0.0",
     "vite": "^5.4.19",