Bump postcss from 8.4.26 to 8.4.31

Bumps [postcss](https://github.com/postcss/postcss) from 8.4.26 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@8.4.26...8.4.31)

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

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

package-lock.json

@@ -41,7 +41,7 @@
     "jest": "^29.6.1",
     "jest-environment-jsdom": "^29.6.1",
     "next-test-api-route-handler": "^3.1.8",
-    "postcss": "^8.4.26",
+    "postcss": "^8.4.31",
     "prettier": "^3.0.0",
     "tailwindcss": "^3.3.3"
   },