ed448: do not pull std (#984)

Author: baloo

ed448/Cargo.toml

@@ -23,7 +23,7 @@ signature = { version = "3.0.0-rc.0", default-features = false }
 # optional dependencies
 pkcs8 = { version = "0.11.0-rc.1", optional = true }
 serde = { version = "1", optional = true, default-features = false }
-serde_bytes = { version = "0.11", optional = true }
+serde_bytes = { version = "0.11", optional = true, default-features = false }
 zeroize = { version = "1", optional = true, default-features = false }
 
 [dev-dependencies]
@@ -35,4 +35,4 @@ default = ["std"]
 alloc = ["pkcs8?/alloc"]
 pem = ["alloc", "pkcs8/pem"]
 serde_bytes = ["serde", "dep:serde_bytes"]
-std = ["pkcs8?/std"]
+std = ["pkcs8?/std", "serde_bytes?/std"]