Update vmm-sys-util to 0.12.0

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

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

Cargo.lock

@@ -24,9 +24,9 @@ dependencies = [
 
 [[package]]
 name = "vmm-sys-util"
-version = "0.11.0"
+version = "0.12.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "cc06a16ee8ebf0d9269aed304030b0d20a866b8b3dd3d4ce532596ac567a0d24"
+checksum = "1d1435039746e20da4f8d507a72ee1b916f7b4b05af7a91c093d2c6561934ede"
 dependencies = [
  "bitflags",
  "libc",

Cargo.toml

@@ -7,4 +7,4 @@ edition = "2021"
 
 [dependencies]
 libc = "0.2.66"
-vmm-sys-util = "0.11.0"
+vmm-sys-util = "0.12.1"