Replace public visitors to internal

Author: Jakab László

src/AutSoft.Linq/Expressions/ExpressionVisitors/ParameterUpdateVisitor.cs

@@ -5,7 +5,7 @@ namespace AutSoft.Linq.Expressions.ExpressionVisitors;
 /// <summary>
 /// An <see cref="ExpressionVisitor"/>, which update a <see cref="ParameterExpression"/>
 /// </summary>
-public class ParameterUpdateVisitor : ExpressionVisitor
+internal class ParameterUpdateVisitor : ExpressionVisitor
 {
     private readonly ParameterExpression _oldParameter;
     private readonly ParameterExpression _newParameter;

src/AutSoft.Linq/Expressions/ExpressionVisitors/SwapVisitor.cs

@@ -5,7 +5,7 @@ namespace AutSoft.Linq.Expressions.ExpressionVisitors;
 /// <summary>
 /// An <see cref="ExpressionVisitor"/>, which swap the visited <see cref="Expression"/> to an other
 /// </summary>
-public class SwapVisitor : ExpressionVisitor
+internal class SwapVisitor : ExpressionVisitor
 {
     private readonly Expression _source;
     private readonly Expression _replacement;