build: bump virtio-queue from 0.2.0 to 0.3.0

Bumps [virtio-queue](https://github.com/rust-vmm/vm-virtio) from 0.2.0 to 0.3.0.
- [Release notes](https://github.com/rust-vmm/vm-virtio/releases)
- [Commits](https://github.com/rust-vmm/vm-virtio/compare/virtio-queue-v0.2.0...virtio-queue-v0.3.0)

Also relies on main branch from vhost-user-backend since it moved to
virtio-queue 0.3.0 as well, and without this change it wouldn't compile.

---
updated-dependencies:
- dependency-name: virtio-queue
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>
Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>

vm-allocator/Cargo.toml

@@ -6,5 +6,5 @@ edition = "2021"
 
 [dependencies]
 libc = "0.2.125"
-vm-memory = "0.7.0"
+vm-memory = "0.8.0"
 arch = { path = "../arch" }