chore: Remove unnecessary dependency

Author: davidsemakula

integration-tests/public/fallible-setter/Cargo.toml

@@ -10,7 +10,6 @@ ink = { path = "../../../crates/ink", default-features = false }
 
 [dev-dependencies]
 ink_e2e = { path = "../../../crates/e2e" }
-hex = { version = "0.4.3" }
 
 [lib]
 path = "lib.rs"