Update spec tests to v1.1.0-beta.4 (#2548)

## Proposed Changes

Bump the spec tests to beta.4, including the new randomised tests (which all pass 🎉)

crypto/bls/src/generic_aggregate_public_key.rs

@@ -1,4 +1,8 @@
-use crate::{generic_public_key::GenericPublicKey, Error};
+use crate::{
+    generic_public_key::{GenericPublicKey, TPublicKey},
+    Error,
+};
+use std::fmt::{self, Debug};
 use std::marker::PhantomData;
 
 /// Implemented on some struct from a BLS library so it may be used internally in this crate.
@@ -35,3 +39,13 @@ where
         })
     }
 }
+
+impl<Pub, AggPub> Debug for GenericAggregatePublicKey<Pub, AggPub>
+where
+    AggPub: TAggregatePublicKey<Pub>,
+    Pub: TPublicKey,
+{
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        write!(f, "{:?}", self.to_public_key())
+    }
+}

crypto/bls/src/generic_aggregate_signature.rs

@@ -194,6 +194,20 @@ where
         }
     }
 
+    /// Wrapper for `fast_aggregate_verify` accepting `G2_POINT_AT_INFINITY` signature when
+    /// `pubkeys` is empty.
+    pub fn eth_fast_aggregate_verify(
+        &self,
+        msg: Hash256,
+        pubkeys: &[&GenericPublicKey<Pub>],
+    ) -> bool {
+        if pubkeys.is_empty() && self.is_infinity() {
+            true
+        } else {
+            self.fast_aggregate_verify(msg, pubkeys)
+        }
+    }
+
     /// Verify that `self` represents an aggregate signature where all `pubkeys` have signed their
     /// corresponding message in `msgs`.
     ///