Rust Dependency: Update scroll requirement from 0.11 to 0.12 (#399)

Updates the requirements on [scroll](https://github.com/m4b/scroll) to
permit the latest version.

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Cargo.toml

@@ -24,4 +24,4 @@ num-derive = { version = "0.4", default-features = false}
 r-efi = "4.3.0"
 rustversion = "1.0.14"
 spin = "0.9.8"
-scroll = { version = "0.11", default-features = false, features = ["derive"]}
+scroll = { version = "0.12", default-features = false, features = ["derive"]}