build(deps-dev): update postcss to 8.5.15 (#33)

Bumps the npm_and_yarn group with 1 update in the / directory: [postcss](https://github.com/postcss/postcss).


Updates `postcss` from 8.5.9 to 8.5.15
- [Release notes](https://github.com/postcss/postcss/releases)
- [Changelog](https://github.com/postcss/postcss/blob/main/CHANGELOG.md)
- [Commits](postcss/postcss@8.5.9...8.5.15)

---
updated-dependencies:
- dependency-name: postcss
  dependency-version: 8.5.15
  dependency-type: direct:development
  dependency-group: npm_and_yarn
...

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Author: dependabot[bot]

package-lock.json

@@ -37,7 +37,7 @@
     "@vitejs/plugin-react": "^6.0.1",
     "autoprefixer": "^10.4.20",
     "knip": "^6.4.1",
-    "postcss": "^8.4.47",
+    "postcss": "^8.5.15",
     "tailwindcss": "^3.4.14",
     "tsx": "^4.22.4",
     "typescript": "5.6.3",