build(deps): bump rust-vmm-ci from aee82cf to b6858b2

Bumps [rust-vmm-ci](https://github.com/rust-vmm/rust-vmm-ci) from `aee82cf` to `b6858b2`.
- [Release notes](https://github.com/rust-vmm/rust-vmm-ci/releases)
- [Commits](rust-vmm/rust-vmm-ci@aee82cf...b6858b2)

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

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]