Merge pull request #1954 from alphagov/dependabot/npm_and_yarn/postcss-8.5.8

Bump postcss from 8.5.6 to 8.5.8

Author: alice-carr

package-lock.json

@@ -24,7 +24,7 @@
     "autoprefixer": "^10.4.27",
     "cssnano": "^7.1.2",
     "jsdom": "^28.1.0",
-    "postcss": "^8.5.6",
+    "postcss": "^8.5.8",
     "sass": "^1.97.3",
     "snazzy": "^9.0.0",
     "standard": "^17.1.2",