backend: Set remote dependency branch as main

The builds are failing since the the remote branch's name is changed to
main from master. Fix it.

Signed-off-by: Viresh Kumar <[email protected]>

Author: vireshk

Cargo.toml

@@ -13,7 +13,7 @@ libc = ">=0.2.39"
 log = ">=0.4.6"
 vhost = { version = "0.1", features = ["vhost-user-slave"] }
 virtio-bindings = "0.1"
-virtio-queue = { git = "https://github.com/rust-vmm/vm-virtio" }
+virtio-queue = { git = "https://github.com/rust-vmm/vm-virtio", branch = "main" }
 vm-memory = {version = "0.6", features = ["backend-mmap", "backend-atomic"]}
 vmm-sys-util = "0.8"