build(deps-dev): bump postcss from 8.5.8 to 8.5.9 (#82)

Bumps [postcss](https://github.com/postcss/postcss) from 8.5.8 to 8.5.9.
- [Release notes](https://github.com/postcss/postcss/releases)
- [Changelog](https://github.com/postcss/postcss/blob/main/CHANGELOG.md)
- [Commits](postcss/postcss@8.5.8...8.5.9)

---
updated-dependencies:
- dependency-name: postcss
  dependency-version: 8.5.9
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

package-lock.json

@@ -47,7 +47,7 @@
     "husky": "9.1.7",
     "jsdom": "29.0.2",
     "lint-staged": "16.4.0",
-    "postcss": "8.5.8",
+    "postcss": "8.5.9",
     "prettier": "3.8.1",
     "prettier-plugin-tailwindcss": "0.7.2",
     "ts-node": "10.9.2",