build(deps): bump postcss from 8.4.24 to 8.4.31

Bumps [postcss](https://github.com/postcss/postcss) from 8.4.24 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/8.4.24...8.4.31)

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

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

package.json

@@ -30,7 +30,7 @@
     "mjml": "^4.15.3",
     "nightwind": "^1.1.13",
     "perl-regex": "^1.0.4",
-    "postcss": "^8.4.24",
+    "postcss": "^8.4.31",
     "remixicon": "^4.3.0",
     "remove-markdown": "^0.5.0",
     "tailwindcss": "^3.3.2",