chore(deps-dev): bump postcss in /frontend-sveltekit

Bumps [postcss](https://github.com/postcss/postcss) from 8.4.31 to 8.4.38.
- [Release notes](https://github.com/postcss/postcss/releases)
- [Changelog](https://github.com/postcss/postcss/blob/main/CHANGELOG.md)
- [Commits](postcss/postcss@8.4.31...8.4.38)

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

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

frontend-sveltekit/package.json

@@ -31,7 +31,7 @@
         "eslint-plugin-svelte": "^2.30.0",
         "houdini": "^1.2.13",
         "houdini-svelte": "^1.2.13",
-        "postcss": "8.4.31",
+        "postcss": "8.4.38",
         "prettier": "^3.0.3",
         "prettier-plugin-svelte": "^3.0.3",
         "svelte": "^4.0.5",