Bumps [preact](https://github.com/developit/preact) from 10.0.0-alpha.2 to 10.0.0-alpha.4.
- [Release notes](https://github.com/developit/preact/releases)
- [Commits](https://github.com/developit/preact/compare/10.0.0-alpha.2...10.0.0-alpha.4)
Signed-off-by: dependabot[bot] <support@dependabot.com>