build(deps): bump rust-vmm-ci from 042b206 to b4bb768

Bumps [rust-vmm-ci](https://github.com/rust-vmm/rust-vmm-ci) from `042b206` to `b4bb768`.
- [Commits](rust-vmm/rust-vmm-ci@042b206...b4bb768)

---
updated-dependencies:
- dependency-name: rust-vmm-ci
  dependency-version: b4bb7687a11bc6bdb07a37b71d2795b9fe77863f
  dependency-type: direct:production
...

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Author: dependabot[bot]