chore: Bump autoprefixer from 10.4.16 to 10.4.20 in /apps/web-admin

Bumps [autoprefixer](https://github.com/postcss/autoprefixer) from 10.4.16 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@10.4.16...10.4.20)

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

Signed-off-by: dependabot[bot] <[email protected]>

apps/web-admin/package.json

@@ -20,7 +20,7 @@
     "@mui/icons-material": "^5.15.10",
     "@mui/material": "^5.15.9",
     "@mui/x-data-grid": "^6.19.3",
-    "autoprefixer": "10.4.16",
+    "autoprefixer": "10.4.20",
     "axios": "^1.5.1",
     "canvas": "^2.11.2",
     "clsx": "^2.0.0",