chore(deps-dev): bump autoprefixer from 10.4.19 to 10.4.20 in /web/admin

Bumps [autoprefixer](https://github.com/postcss/autoprefixer) from 10.4.19 to 10.4.20.
- [Release notes](https://github.com/postcss/autoprefixer/releases)
- [Changelog](https://github.com/postcss/autoprefixer/blob/main/CHANGELOG.md)
- [Commits](postcss/autoprefixer@10.4.19...10.4.20)

---
updated-dependencies:
- dependency-name: autoprefixer
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

web/admin/package.json

@@ -57,7 +57,7 @@
     "@vitejs/plugin-vue": "^3.1.2",
     "@vitejs/plugin-vue-jsx": "^2.0.1",
     "@vue/babel-plugin-jsx": "^1.1.1",
-    "autoprefixer": "^10.4.19",
+    "autoprefixer": "^10.4.20",
     "code-inspector-plugin": "^0.13.0",
     "consola": "^2.15.3",
     "cross-env": "^7.0.3",