Bump autoprefixer from 10.2.6 to 10.3.1

Bumps [autoprefixer](https://github.com/postcss/autoprefixer) from 10.2.6 to 10.3.1.
- [Release notes](https://github.com/postcss/autoprefixer/releases)
- [Changelog](https://github.com/postcss/autoprefixer/blob/main/CHANGELOG.md)
- [Commits](postcss/autoprefixer@10.2.6...10.3.1)

---
updated-dependencies:
- dependency-name: autoprefixer
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

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",