Bump autoprefixer from 9.8.6 to 10.3.1 (#684)

Bumps [autoprefixer](https://github.com/postcss/autoprefixer) from 9.8.6 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@9.8.6...10.3.1)

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

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

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Patrice Chalin <[email protected]>

package.json

@@ -5,7 +5,7 @@
   },
   "private": true,
   "devDependencies": {
-    "autoprefixer": "^9.8.6",
+    "autoprefixer": "^10.3.1",
     "bulma": "^0.9.3",
     "esm": "^3.2.25",
     "node-fetch": "^2.6.1",