Bump postcss from 8.5.1 to 8.5.5

Bumps [postcss](https://github.com/postcss/postcss) from 8.5.1 to 8.5.5.
- [Release notes](https://github.com/postcss/postcss/releases)
- [Changelog](https://github.com/postcss/postcss/blob/main/CHANGELOG.md)
- [Commits](postcss/postcss@8.5.1...8.5.5)

---
updated-dependencies:
- dependency-name: postcss
  dependency-version: 8.5.5
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

package.json

@@ -40,7 +40,7 @@
     "eslint": "^8.57.0",
     "eslint-plugin-jest": "^28.11.0",
     "eslint-plugin-svelte": "^2.46.1",
-    "postcss": "^8.5.1",
+    "postcss": "^8.5.5",
     "prettier": "3.3.3",
     "prettier-plugin-astro": "^0.14.1",
     "prettier-plugin-svelte": "^3.3.3",