build(deps): bump autoprefixer from 10.3.3 to 10.3.4 (nodejs#4097)

bump autoprefixer from 10.3.3 to 10.3.4

Author: dependabot[bot]

package-lock.json

@@ -37,7 +37,7 @@
   },
   "dependencies": {
     "@metalsmith/permalinks": "^2.3.0",
-    "autoprefixer": "^10.3.3",
+    "autoprefixer": "^10.3.4",
     "cheerio": "^0.22.0",
     "graceful-fs": "^4.2.8",
     "handlebars": "^4.7.7",