Update sev requirement from 1.2.0 to 2.0.2 in /az-cvm-vtpm

Updates the requirements on [sev](https://github.com/virtee/sev) to permit the latest version.
- [Commits](https://github.com/virtee/sev/commits)

---
updated-dependencies:
- dependency-name: sev
  dependency-type: direct:production
...

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

az-cvm-vtpm/Cargo.toml

@@ -45,6 +45,6 @@ openssl = "0.10"
 serde = { version = "1.0.189", features = ["derive"] }
 serde_json = "1.0.107"
 thiserror = "1.0.38"
-sev = "1.2.0"
+sev = "2.0.2"
 ureq = { version = "2.6.2", default-features = false, features = ["json"] }
 zerocopy = { version = "0.7.26", features = ["derive"] }