Use the official metalsmith postcss plugin

Metalsmith is being updated fairly regularly now, and have an [official PostCSS plugin](https://github.com/metalsmith/postcss). We've been blocked on bumping some dependencies because of this (#2016). I've run `npm build` and there is one small prefixing change in the resulting CSS, but otherwise it's exactly the same.
alphagov · Jul 21, 2022 · 3cdbd4d · 3cdbd4d
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diff --git a/lib/metalsmith.js b/lib/metalsmith.js
@@ -13,7 +13,7 @@ const permalinks = require('metalsmith-permalinks') // apply a permalink pattern
 const canonical = require('metalsmith-canonical') // add a canonical url property to pages
 
 const sass = require('@metalsmith/sass') // convert Sass files to CSS using Dart Sass
-const postcss = require('metalsmith-postcss')
+const postcss = require('@metalsmith/postcss')
 
 const rollup = require('metalsmith-rollup') // used to build GOV.UK Frontend JavaScript
 const resolve = require('rollup-plugin-node-resolve') // rollup plugin to resolve node_modules