Remove stale proto serializer imports

Signed-off-by: Herrtian <70463940+Herrtian@users.noreply.github.com>

Author: Herrtian

datafusion/proto/src/physical_plan/to_proto.rs

@@ -36,8 +36,8 @@ use datafusion_physical_expr::scalar_subquery::ScalarSubqueryExpr;
 use datafusion_physical_expr::window::{SlidingAggregateWindowExpr, StandardWindowExpr};
 use datafusion_physical_expr_common::sort_expr::PhysicalSortExpr;
 use datafusion_physical_plan::expressions::{
-    CaseExpr, CastExpr, DynamicFilterPhysicalExpr, InListExpr, IsNotNullExpr, IsNullExpr,
-    LikeExpr, Literal, NegativeExpr, NotExpr, TryCastExpr, UnKnownColumn,
+    CaseExpr, CastExpr, DynamicFilterPhysicalExpr, IsNotNullExpr, IsNullExpr, Literal,
+    NegativeExpr, TryCastExpr, UnKnownColumn,
 };
 use datafusion_physical_plan::joins::{HashExpr, HashTableLookupExpr};
 use datafusion_physical_plan::udaf::AggregateFunctionExpr;