Update dependency autoprefixer to v10.4.21

Author: renovate[bot]

package-lock.json

@@ -31,7 +31,7 @@
   "devDependencies": {
     "@babel/core": "7.22.5",
     "@babel/preset-env": "7.22.5",
-    "autoprefixer": "10.4.14",
+    "autoprefixer": "10.4.21",
     "babelify": "10.0.0",
     "browserify": "17.0.0",
     "eslint": "8.42.0",