Merge pull request #399 from textpattern/dependabot/npm_and_yarn/autoprefixer-10.3.1

Bump autoprefixer from 10.2.6 to 10.3.1

Author: philwareham

package.json

@@ -12,7 +12,7 @@
   "devDependencies": {
     "@lodder/grunt-postcss": "3.0.1",
     "@squoosh/cli": "0.7.1",
-    "autoprefixer": "10.2.6",
+    "autoprefixer": "10.3.1",
     "cssnano": "5.0.6",
     "grunt": "1.4.1",
     "grunt-cli": "1.4.3",