Update Rust crate thiserror to v2

Author: oxide-renovate[bot]

Cargo.toml

@@ -49,7 +49,7 @@ socket2 = { version = "0.5", features = ["all"] }
 ispf = { git = "https://github.com/oxidecomputer/ispf" }
 serde = { version = "1.0.215", features = ["derive"] }
 hostname = "0.3"
-thiserror = "1.0"
+thiserror = "2.0"
 dropshot = { version = "0.12.0", features = [ "usdt-probes" ] }
 schemars = { version = "0.8", features = [ "uuid1", "chrono" ] }
 tokio = { version = "1.37", features = ["full"] }