chore: Fix warnings for Rust 1.89 (#32378)

Closes #ISSUE

Release Notes:

- N/A

crates/extension_host/src/wasm_host.rs

@@ -724,7 +724,7 @@ impl IncrementalCompilationCache {
 }
 
 impl CacheStore for IncrementalCompilationCache {
-    fn get(&self, key: &[u8]) -> Option<Cow<[u8]>> {
+    fn get(&self, key: &[u8]) -> Option<Cow<'_, [u8]>> {
         self.cache.get(key).map(|v| v.into())
     }