Bump autoprefixer from 9.5.1 to 9.6.0 (#11038)

Bumps [autoprefixer](https://github.com/postcss/autoprefixer) from 9.5.1 to 9.6.0.
- [Release notes](https://github.com/postcss/autoprefixer/releases)
- [Changelog](https://github.com/postcss/autoprefixer/blob/master/CHANGELOG.md)
- [Commits](https://github.com/postcss/autoprefixer/compare/9.5.1...9.6.0

)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>