chore: remove deprecated syntax

Author: zachdaniel

lib/sql_implementation.ex

@@ -188,7 +188,7 @@ defmodule AshPostgres.SqlImplementation do
         type
       ) do
     if function_exported?(attr_type, :postgres_reference_expr, 3) do
-      non_bare_ref = %Ash.Query.Ref{ref | bare?: nil}
+      non_bare_ref = %{ref | bare?: nil}
       {expr, acc} = AshSql.Expr.dynamic_expr(query, non_bare_ref, bindings, embedded?, type, acc)
 
       case attr_type.postgres_reference_expr(attr_type, constraints, expr) do