fix lint errors

Author: benbrandt

runtime/src/lib.rs

@@ -4,6 +4,11 @@
     reason = "some pyo3 macros produce code that does this"
 )]
 #![allow(static_mut_refs, reason = "wit-bindgen produces code that does this")]
+#![allow(unknown_lints)]
+#![allow(
+    unnecessary_transmutes,
+    reason = "nightly warning but not supported on stable"
+)]
 
 use {
     anyhow::{Error, Result},