Add 'sp-std' application crypto after merge.

Remove redundant variable in bls test.

substrate/primitives/application-crypto/Cargo.toml

@@ -18,6 +18,7 @@ targets = ["x86_64-unknown-linux-gnu"]
 
 
 [dependencies]
+sp-std = { workspace = true }
 sp-core = { workspace = true }
 codec = { features = ["derive"], workspace = true }
 scale-info = { features = ["derive"], workspace = true }

substrate/primitives/core/src/bls.rs

@@ -28,7 +28,7 @@ use crate::crypto::{
 	SignatureBytes, UncheckedFrom,
 };
 
-use alloc::vec::Vec;
+use sp_std::vec::Vec;
 
 use w3f_bls::{
 	DoublePublicKey, DoublePublicKeyScheme, DoubleSignature, EngineBLS, Keypair, Message,
@@ -308,11 +308,10 @@ mod tests {
 			Public::unchecked_from(array_bytes::hex2array_unchecked(hex_expected_pub_key))
 		);
 		let message = b"";
-		let signature = array_bytes::hex2array_unchecked(hex_expected_signature);
+		let expected_signature_bytes = array_bytes::hex2array_unchecked(hex_expected_signature);
 
-		let expected_signature = Signature::unchecked_from(signature);
+		let expected_signature = Signature::unchecked_from(expected_signature_bytes);
 		let signature = pair.sign(&message[..]);
-		let signature_bytes: &[u8] = signature.as_ref();
 		assert!(signature == expected_signature);
 		assert!(Pair::verify(&signature, &message[..], &public));
 	}