ed25519: Don't panic for invalid signature (#12965)

* ed25519: Don't panic for invalid signature

We should not panic for an invalid signature when the `UseDalekExt` is given.

* Update Cargo.toml

* Update primitives/io/Cargo.toml

substrate/primitives/io/Cargo.toml

@@ -31,7 +31,11 @@ futures = { version = "0.3.21", features = ["thread-pool"], optional = true }
 secp256k1 = { version = "0.24.0", features = ["recovery", "global-context"], optional = true }
 tracing = { version = "0.1.29", default-features = false }
 tracing-core = { version = "0.1.28", default-features = false}
+
+# Required for backwards compatibility reason, but only used for verifying when `UseDalekExt` is set.
 ed25519-dalek = { version = "1.0.1", default-features = false, optional = true }
+# Force the usage of ed25519, this is being used in `ed25519-dalek`.
+ed25519 = { version = "1.5.2", optional = true }
 
 [features]
 default = ["std"]
@@ -53,6 +57,7 @@ std = [
 	"log",
 	"futures",
 	"ed25519-dalek",
+	"ed25519",
 ]
 
 with-tracing = [