build(deps-dev): bump postcss (#5346)

Bumps the npm_and_yarn group with 1 update in the /site directory: [postcss](https://github.com/postcss/postcss).


Updates `postcss` from 8.5.8 to 8.5.12
- [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/8.5.8...8.5.12)

---
updated-dependencies:
- dependency-name: postcss
  dependency-version: 8.5.12
  dependency-type: direct:development
  dependency-group: npm_and_yarn
...

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

site/package-lock.json

@@ -10,7 +10,7 @@
       "license": "ISC",
       "devDependencies": {
         "autoprefixer": "^10.4.14",
-        "postcss": "^8.4.24",
+        "postcss": "^8.5.12",
         "postcss-cli": "^10.1.0"
       }
     },
@@ -683,9 +683,9 @@
       }
     },
     "node_modules/postcss": {
-      "version": "8.5.8",
-      "resolved": "https://registry.npmjs.org/postcss/-/postcss-8.5.8.tgz",
-      "integrity": "sha512-OW/rX8O/jXnm82Ey1k44pObPtdblfiuWnrd8X7GJ7emImCOstunGbXUpp7HdBrFQX6rJzn3sPT397Wp5aCwCHg==",
+      "version": "8.5.12",
+      "resolved": "https://registry.npmjs.org/postcss/-/postcss-8.5.12.tgz",
+      "integrity": "sha512-W62t/Se6rA0Az3DfCL0AqJwXuKwBeYg6nOaIgzP+xZ7N5BFCI7DYi1qs6ygUYT6rvfi6t9k65UMLJC+PHZpDAA==",
       "dev": true,
       "funding": [
         {

site/package.json

@@ -7,7 +7,7 @@
   "license": "ISC",
   "devDependencies": {
     "autoprefixer": "^10.4.14",
-    "postcss": "^8.4.24",
+    "postcss": "^8.5.12",
     "postcss-cli": "^10.1.0"
   }
 }