Update vmm-sys-util requirement from 0.8 to 0.9

Updates the requirements on [vmm-sys-util](https://github.com/rust-vmm/vmm-sys-util) to permit the latest version.
- [Release notes](https://github.com/rust-vmm/vmm-sys-util/releases)
- [Changelog](https://github.com/rust-vmm/vmm-sys-util/blob/main/CHANGELOG.md)
- [Commits](https://github.com/rust-vmm/vmm-sys-util/compare/v0.8.0...v0.9.0)

---
updated-dependencies:
- dependency-name: vmm-sys-util
  dependency-type: direct:production
...

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

Cargo.toml

@@ -15,7 +15,7 @@ vhost = { version = "0.2", features = ["vhost-user-slave"] }
 virtio-bindings = "0.1"
 virtio-queue = { git = "https://github.com/rust-vmm/vm-virtio", rev = "6013dd9" }
 vm-memory = {version = "0.6", features = ["backend-mmap", "backend-atomic"]}
-vmm-sys-util = "0.8"
+vmm-sys-util = "0.9"
 
 [dev-dependencies]
 vm-memory = {version = "0.6", features = ["backend-mmap", "backend-atomic", "backend-bitmap"]}