[npm] Bump postcss from 8.4.39 to 8.4.47

Bumps [postcss](https://github.com/postcss/postcss) from 8.4.39 to 8.4.47.
- [Release notes](https://github.com/postcss/postcss/releases)
- [Changelog](https://github.com/postcss/postcss/blob/main/CHANGELOG.md)
- [Commits](postcss/postcss@8.4.39...8.4.47)

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

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

package.json

@@ -35,7 +35,7 @@
     "eslint": "^8.28.0",
     "eslint-config-prettier": "^9.1.0",
     "eslint-plugin-svelte": "^2.30.0",
-    "postcss": "8.4.39",
+    "postcss": "8.4.47",
     "prettier": "^3.3.3",
     "prettier-plugin-svelte": "^3.1.2",
     "svelte": "^4.2.19",