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](https://github.com/postcss/autoprefixer/compare/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] <support@github.com>

package.json

@@ -17,7 +17,7 @@
     "@typescript-eslint/eslint-plugin": "^4.29.0",
     "@typescript-eslint/parser": "^4.29.0",
     "@uupaa/dynamic-import-polyfill": "^1.0.2",
-    "autoprefixer": "^10.2.6",
+    "autoprefixer": "^10.3.1",
     "babel-loader": "^8.2.2",
     "babel-plugin-dynamic-import-polyfill": "^1.0.0",
     "clean-webpack-plugin": "^3.0.0",