Merge pull request #782 from textpattern/dependabot/npm_and_yarn/autoprefixer-10.5.4

Bump autoprefixer from 10.5.2 to 10.5.4

Author: petecooper

package.json

@@ -11,7 +11,7 @@
   },
   "devDependencies": {
     "@lodder/grunt-postcss": "3.1.1",
-    "autoprefixer": "10.5.2",
+    "autoprefixer": "10.5.4",
     "cssnano": "8.0.2",
     "grunt": "1.6.2",
     "grunt-cli": "1.5.0",