build(deps-dev): bump postcss in /pkgs/servers/jellyseerr

Bumps [postcss](https://github.com/postcss/postcss) from 8.4.20 to 8.4.31.
- [Release notes](https://github.com/postcss/postcss/releases)
- [Changelog](https://github.com/postcss/postcss/blob/main/CHANGELOG.md)
- [Commits](postcss/postcss@8.4.20...8.4.31)

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

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

pkgs/servers/jellyseerr/package.json

@@ -156,7 +156,7 @@
     "husky": "8.0.3",
     "lint-staged": "13.1.0",
     "nodemon": "2.0.20",
-    "postcss": "8.4.20",
+    "postcss": "8.4.31",
     "prettier": "2.8.1",
     "prettier-plugin-organize-imports": "3.2.1",
     "prettier-plugin-tailwindcss": "0.2.1",