Updating SEV library to 6.1.0 and updating version to 0.9.1

Some report bug fixes needed were just released on the 6.1.0 library, so
we are doing a fix release for snpguest to include these.

Signed-off-by: DGonzalezVillal <Diego.GonzalezVillalobos@amd.com>

Author: DGonzalezVillal

Cargo.lock

@@ -1,6 +1,6 @@
 [package]
 name = "snpguest"
-version = "0.9.0"
+version = "0.9.1"
 authors = ["The VirTEE Project Developers"]
 edition = "2021"
 license = "Apache-2.0"
@@ -22,7 +22,7 @@ hyperv = ["tss-esapi"]
 clap = { version = "4.5", features = [ "derive" ] }
 env_logger = "0.10.0"
 anyhow = "1.0.69"
-sev = { version = "6.0.0", default-features = false, features = ['openssl','snp']}
+sev = { version = "6.1.0", default-features = false, features = ['openssl','snp']}
 nix = "^0.23"
 serde = { version = "1.0", features = ["derive"] }
 bincode = "^1.2.1"