Update vmm-sys-util to 0.12.1

The update brings a fix for a security vulnerability behind
feature-gated code not used by vm-virtio (the `with-serde` feature),
see GHSA-875g-mfp6-g7f9

Signed-off-by: Patrick Roy <roypat@amazon.co.uk>

Author: roypat

virtio-blk/Cargo.toml

@@ -14,7 +14,7 @@ backend-stdio = []
 
 [dependencies]
 vm-memory = "0.13.1"
-vmm-sys-util = "0.11.0"
+vmm-sys-util = "0.12.1"
 log = "0.4.17"
 virtio-queue = { path = "../virtio-queue" }
 virtio-device = { path = "../virtio-device" }

virtio-queue/Cargo.toml

@@ -14,7 +14,7 @@ test-utils = []
 
 [dependencies]
 vm-memory = "0.13.1"
-vmm-sys-util = "0.11.0"
+vmm-sys-util = "0.12.1"
 log = "0.4.17"
 virtio-bindings = { path="../virtio-bindings", version = "0.2.2" }