chore(deps): update dependency autoprefixer to v9.5.1 (#519)

Author: renovate[bot]

package-lock.json

@@ -40,7 +40,7 @@
     "@wordpress/jest-preset-default": "4.0.0",
     "@wordpress/rich-text": "3.2.2",
     "@wordpress/scripts": "3.1.0",
-    "autoprefixer": "9.5.0",
+    "autoprefixer": "9.5.1",
     "babel-core": "7.0.0-bridge.0",
     "babel-eslint": "10.0.1",
     "babel-loader": "8.0.5",