build(deps): bump vmm-sys-util from 0.12.1 to 0.15.0

Bumps [vmm-sys-util](https://github.com/rust-vmm/vmm-sys-util) from 0.12.1 to 0.15.0.
- [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](rust-vmm/vmm-sys-util@v0.12.1...v0.15.0)

---
updated-dependencies:
- dependency-name: vmm-sys-util
  dependency-version: 0.15.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

Cargo.lock

@@ -25,7 +25,7 @@ eif_loader = { path = "./eif_loader" }
 enclave_build = { path = "./enclave_build" }
 openssl = "0.10.72"
 vsock = "0.5"
-vmm-sys-util = "0.12.1"
+vmm-sys-util = "0.15.0"
 sha2 = "0.9.5"
 hex = "0.4"