Merge pull request #177 from WebComponentsGuide/renovate/devdependencies

Update dependency autoprefixer to v10.4.21

Author: keithamus

Diff for: package-lock.json

@@ -80,7 +80,7 @@
     "@jamshop/eleventy-plugin-esbuild": "WebComponentsGuide/eleventy-plugin-esbuild",
     "@oddbird/popover-polyfill": "^0.5.0",
     "@ungap/custom-elements": "^1.1.1",
-    "autoprefixer": "10.4.20",
+    "autoprefixer": "10.4.21",
     "cheerio": "1.0.0",
     "construct-style-sheets-polyfill": "^3.1.0",
     "cssnano": "^6.0.1",