Fix Clippy for Rust 1.90 beta (#7826)

Fix Clippy for recently released Rust 1.90 beta. There may be more changes required when Rust 1.89 stable is released in a few days, but possibly not 🤞

crypto/bls/tests/tests.rs

@@ -370,7 +370,7 @@ macro_rules! test_suite {
         }
 
         impl OwnedSignatureSet {
-            pub fn multiple_pubkeys(&self) -> SignatureSet {
+            pub fn multiple_pubkeys(&self) -> SignatureSet<'_> {
                 let signing_keys = self.signing_keys.iter().map(Cow::Borrowed).collect();
                 SignatureSet::multiple_pubkeys(&self.signature, signing_keys, self.message)
             }