Update Rust crate nom to v8

Author: oxide-renovate[bot]

Cargo.toml

@@ -82,7 +82,7 @@ tabwriter = { version = "1", features = ["ansi_formatting"] }
 colored = "3.0"
 ztest = { git = "https://github.com/oxidecomputer/falcon", branch = "main" }
 anstyle = "1.0.11"
-nom = "7.1"
+nom = "8.0"
 num_enum = "0.7.4"
 pretty-hex = "0.4"
 pretty_assertions = "1.4"