test: fix inference fail in test (#2239)

Author: DaniPopes

crates/contract/src/call.rs

@@ -835,14 +835,14 @@ mod tests {
             .expect("tx not included");
         assert_eq!(
             transaction.max_fee_per_gas(),
-            max_fee_per_gas.to(),
+            max_fee_per_gas.to::<u128>(),
             "max_fee_per_gas of the transaction should be set to the right value"
         );
         assert_eq!(
             transaction
                 .max_priority_fee_per_gas()
                 .expect("max_priority_fee_per_gas of the transaction should be set"),
-            max_priority_fee_per_gas.to(),
+            max_priority_fee_per_gas.to::<u128>(),
             "max_priority_fee_per_gas of the transaction should be set to the right value"
         )
     }