Bump autoprefixer from 9.7.3 to 9.7.4 (#12890)

Bumps [autoprefixer](https://github.com/postcss/autoprefixer) from 9.7.3 to 9.7.4.
- [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/9.7.3...9.7.4

)

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