chore(deps-dev): bump postcss from 8.4.47 to 8.5.6

Bumps [postcss](https://github.com/postcss/postcss) from 8.4.47 to 8.5.6.
- [Release notes](https://github.com/postcss/postcss/releases)
- [Changelog](https://github.com/postcss/postcss/blob/main/CHANGELOG.md)
- [Commits](postcss/postcss@8.4.47...8.5.6)

---
updated-dependencies:
- dependency-name: postcss
  dependency-version: 8.5.6
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

app/package.json

@@ -38,7 +38,7 @@
     "autoprefixer": "^10.4.17",
     "eslint": "^8.56.0",
     "eslint-config-next": "14.0.4",
-    "postcss": "^8.4.33",
+    "postcss": "^8.5.6",
     "tailwindcss": "^3.4.1",
     "typescript": "~5.3.3"
   }