Bump postcss from 8.4.22 to 8.4.31 (#169)

Bumps [postcss](https://github.com/postcss/postcss) from 8.4.22 to 8.4.31.
- [Release notes](https://github.com/postcss/postcss/releases)
- [Changelog](https://github.com/postcss/postcss/blob/main/CHANGELOG.md)
- [Commits](https://github.com/postcss/postcss/compare/8.4.22...8.4.31)

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

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

package.json

@@ -3,7 +3,7 @@
         "@tailwindcss/typography": "^0.5.9",
         "autoprefixer": "^10.4.14",
         "cssnano": "^6.0.1",
-        "postcss": "^8.4.27",
+        "postcss": "^8.4.31",
         "postcss-cli": "^10.1.0",
         "postcss-import": "^15.1.0",
         "tailwindcss": "^3.3.3"