Fix 1.89 clippy warnings (#2055)

* Fix 1.89 clippy warnings

* WASM lightclient clippy fixes too

metadata/src/lib.rs

@@ -240,7 +240,7 @@ impl Metadata {
     }
 
     /// Obtain a unique hash representing this metadata or specific parts of it.
-    pub fn hasher(&self) -> MetadataHasher {
+    pub fn hasher(&self) -> MetadataHasher<'_> {
         MetadataHasher::new(self)
     }