fix: remove unused import

Author: csgui

clarity/src/vm/mod.rs

@@ -59,7 +59,6 @@ pub mod clarity;
 use std::collections::BTreeMap;
 
 use costs::CostErrors;
-use serde_json;
 use stacks_common::types::StacksEpochId;
 
 use self::analysis::ContractAnalysis;