Update bare-metal requirement from 0.1.2 to 0.2.4 (#6)
Update bare-metal requirement from 0.1.2 to 0.2.4 (#6)

Updates the requirements on [bare-metal](https://github.com/japaric/bare-metal) to permit the latest version.
- [Release notes](https://github.com/japaric/bare-metal/releases)
- [Changelog](https://github.com/japaric/bare-metal/blob/master/CHANGELOG.md)
- [Commits](https://github.com/japaric/bare-metal/commits/v0.2.4)

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@dependabot.com>
lucasbrendel/xmc4200,lucasbrendel/xmc4200