chore(deps): update dependency @fullhuman/postcss-purgecss to v7

Author: renovate[bot]

docs/package.json

@@ -36,7 +36,7 @@
     "@11ty/eleventy-plugin-syntaxhighlight": "5.0.0",
     "@fontsource/inter": "^5.0.16",
     "@fortawesome/fontawesome-free": "^6.4.0",
-    "@fullhuman/postcss-purgecss": "6.0.0",
+    "@fullhuman/postcss-purgecss": "7.0.2",
     "@toycode/markdown-it-class": "1.2.4",
     "algoliasearch": "^5.0.0",
     "autoprefixer": "^10.4.14",