Bump rocket

Bumps [rocket](https://github.com/SergioBenitez/Rocket) from 0.4.0-rc.2 to 0.4.7.
- [Release notes](https://github.com/SergioBenitez/Rocket/releases)
- [Changelog](https://github.com/SergioBenitez/Rocket/blob/master/CHANGELOG.md)
- [Commits](rwf2/Rocket@v0.4.0-rc.2...v0.4.7)

---
updated-dependencies:
- dependency-name: rocket
  dependency-type: direct:production
...

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