[move] Remove unused dependency from move-trace-format's manifest (#21130)

## Description 

What the title says

Author: awelc

external-crates/move/Cargo.lock

@@ -14,7 +14,6 @@ ref-cast.workspace = true
 variant_count.workspace = true
 move-core-types.workspace = true
 serde.workspace = true
-arbitrary = { workspace = true, optional = true, features = ["derive"] }
 enum-compat-util.workspace = true
 move-proc-macros.workspace = true
 move-binary-format.workspace = true
@@ -30,5 +29,5 @@ move-core-types = { workspace = true, features = ["fuzzing" ] }
 
 [features]
 default = []
-fuzzing = ["proptest", "proptest-derive", "arbitrary", "move-core-types/fuzzing"]
+fuzzing = ["proptest", "proptest-derive", "move-core-types/fuzzing"]
 wasm = ["getrandom"]