Use the oxide vm-attest repo

Author: flihp

Cargo.toml

@@ -17,6 +17,6 @@ log = "0.4.29"
 serde = { version = "1.0.228", features = ["derive"] }
 serde_json = "1.0.149"
 sha2 = "0.10.9"
-vm-attest  = { git = "https://github.com/flihp/vm-attest", branch = "rename-mock-to-rot" }
+vm-attest.git = "https://github.com/oxidecomputer/vm-attest"
 vsock = "0.5.3"
 x509-cert = "0.2.5"