Replace 'blake2-rfc' with rust-crypto 'blake2' crate (#12266)

* Replace 'blake2-rfc with rust-crypto 'blake2' crate
* Bump blake2 to 0.10.4

substrate/primitives/core/Cargo.toml

@@ -48,7 +48,7 @@ bitflags = "1.3"
 
 # full crypto
 ed25519-zebra = { version = "3.0.0", default-features = false, optional = true}
-blake2-rfc = { version = "0.2.18", default-features = false, optional = true }
+blake2 = { version = "0.10.4", default-features = false, optional = true }
 schnorrkel = { version = "0.9.1", features = [
 	"preaudit_deprecated",
 	"u64_backend",
@@ -98,7 +98,7 @@ std = [
 	"hash-db/std",
 	"sp-std/std",
 	"serde",
-	"blake2-rfc/std",
+	"blake2/std",
 	"ed25519-zebra",
 	"hex/std",
 	"base58",
@@ -130,7 +130,7 @@ std = [
 # For the regular wasm runtime builds this should not be used.
 full_crypto = [
 	"ed25519-zebra",
-	"blake2-rfc",
+	"blake2",
 	"schnorrkel",
 	"hex",
 	"libsecp256k1",