Bump postcss from 8.4.23 to 8.4.31

Bumps [postcss](https://github.com/postcss/postcss) from 8.4.23 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/8.4.23...8.4.31)

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

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

package-lock.json

@@ -4736,9 +4736,9 @@
       "dev": true
     },
     "postcss": {
-      "version": "8.4.30",
-      "resolved": "https://registry.npmmirror.com/postcss/-/postcss-8.4.30.tgz",
-      "integrity": "sha512-7ZEao1g4kd68l97aWG/etQKPKq07us0ieSZ2TnFDk11i0ZfDW2AwKHYU8qv4MZKqN2fdBfg+7q0ES06UA73C1g==",
+      "version": "8.4.31",
+      "resolved": "https://registry.npmmirror.com/postcss/-/postcss-8.4.31.tgz",
+      "integrity": "sha512-PS08Iboia9mts/2ygV3eLpY5ghnUcfLV/EXTOW1E2qYxJKGGBUtNjN76FYHnMs36RmARn41bC0AZmn+rR0OVpQ==",
       "dev": true,
       "requires": {
         "nanoid": "^3.3.6",

package.json

@@ -63,7 +63,7 @@
     "eslint-plugin-promise": "^5.1.0",
     "eslint-plugin-react": "^7.23.2",
     "next-sitemap": "^1.6.203",
-    "postcss": "^8.4.20",
+    "postcss": "^8.4.31",
     "tailwindcss": "^3.3.2",
     "webpack-bundle-analyzer": "^4.5.0"
   },