fix `ambiguous reference` caused by https://github.com/dtolnay/thiserror/pull/354

- This resolves the error of the CI `Miri`: https://github.com/zkat/miette/actions/runs/13572762043/job/37952795757

src/panic.rs

@@ -26,7 +26,7 @@ pub fn set_panic_hook() {
 }
 
 #[derive(Debug, Error, Diagnostic)]
-#[error("{0}{}", Panic::backtrace())]
+#[error("{0}{panic}", panic = Panic::backtrace())]
 #[diagnostic(help("set the `RUST_BACKTRACE=1` environment variable to display a backtrace."))]
 struct Panic(String);