Bump postcss in /frontend in the npm_and_yarn group across 1 directory

Bumps the npm_and_yarn group with 1 update in the /frontend directory: [postcss](https://github.com/postcss/postcss).


Updates `postcss` from 8.4.47 to 8.4.48
- [Release notes](https://github.com/postcss/postcss/releases)
- [Changelog](https://github.com/postcss/postcss/blob/main/CHANGELOG.md)
- [Commits](postcss/postcss@8.4.47...8.4.48)

---
updated-dependencies:
- dependency-name: postcss
  dependency-type: direct:development
  dependency-group: npm_and_yarn
...

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

Author: dependabot[bot]

frontend/package-lock.json

@@ -44,7 +44,7 @@
   },
   "devDependencies": {
     "autoprefixer": "^10.4.20",
-    "postcss": "^8.4.47",
+    "postcss": "^8.4.48",
     "tailwindcss": "^3.4.14"
   }
 }