Bump codec and scale-info in rand-extension (#670)

* add #[ink:chain_extension] example contract

* modify return content

* fix rustfmt CI fail

* bump codec and scale-info in rand-extension

examples/rand-extension/Cargo.toml

@@ -11,8 +11,8 @@ ink_env = { path = "../../crates/env", default-features = false }
 ink_storage = { path = "../../crates/storage", default-features = false }
 ink_lang = { path = "../../crates/lang", default-features = false }
 
-scale = { package = "parity-scale-codec", version = "1.3", default-features = false, features = ["derive"] }
-scale-info = { version = "0.4.1", default-features = false, features = ["derive"], optional = true }
+scale = { package = "parity-scale-codec", version = "2.0.0", default-features = false, features = ["derive"] }
+scale-info = { version = "0.5", default-features = false, features = ["derive"], optional = true }
 
 [lib]
 name = "rand_extension"