Bump postcss from 8.4.14 to 8.4.31 (#25)

Bumps [postcss](https://github.com/postcss/postcss) from 8.4.14 to 8.4.31.
- [Release notes](https://github.com/postcss/postcss/releases)
- [Changelog](https://github.com/postcss/postcss/blob/main/CHANGELOG.md)
- [Commits](postcss/postcss@8.4.14...8.4.31)

---
updated-dependencies:
- dependency-name: postcss
  dependency-type: direct:development
...

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

Author: dependabot[bot]

package-lock.json

@@ -28,7 +28,7 @@
     "autoprefixer": "^10.4.4",
     "eslint": "8.6.0",
     "eslint-config-next": "12.0.7",
-    "postcss": "^8.4.12",
+    "postcss": "^8.4.31",
     "tailwindcss": "^3.1.5",
     "typescript": "^4.6.2"
   }