Prepare for 0.4.7 rc1

[cbgbt]

Testing done:

• [x] build https://github.com/bottlerocket-os/bottlerocket-core-kit
• [x] build https://github.com/bottlerocket-os/bottlerocket using that core-kit
• [x] publish core-kit using overridden registry/repo
• [x] build core-kit using Twoliter.override

Terms of contribution:

By submitting this pull request, I agree that this contribution is dual-licensed under the terms of both the Apache License, version 2.0, and the MIT license.