build(deps-dev): bump postcss from 8.4.31 to 8.4.49 in /docs

Bumps [postcss](https://github.com/postcss/postcss) from 8.4.31 to 8.4.49.
- [Release notes](https://github.com/postcss/postcss/releases)
- [Changelog](https://github.com/postcss/postcss/blob/main/CHANGELOG.md)
- [Commits](postcss/postcss@8.4.31...8.4.49)

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

Signed-off-by: dependabot[bot] <[email protected]>

docs/package.json

@@ -13,7 +13,7 @@
   },
   "devDependencies": {
     "autoprefixer": "~10.4.20",
-    "postcss": "~8.4.47",
+    "postcss": "~8.4.49",
     "tailwindcss": "~3.4.14"
   },
   "engines": {