Use non-deprecated ToSet()

Author: mythz

src/ServiceStack.OrmLite/Async/OrmLiteWriteCommandExtensionsAsync.cs

@@ -395,7 +395,7 @@ internal static async Task InsertUsingDefaultsAsync<T>(this IDbCommand dbCmd, T[
             var fieldsWithoutDefaults = modelDef.FieldDefinitionsArray
                 .Where(x => x.DefaultValue == null)
                 .Select(x => x.Name)
-                .ToHashSet(); 
+                .ToSet(); 
 
             dialectProvider.PrepareParameterizedInsertStatement<T>(dbCmd, insertFields: fieldsWithoutDefaults);
 

src/ServiceStack.OrmLite/OrmLiteResultsFilter.cs

@@ -255,7 +255,7 @@ public HashSet<T> GetColumnDistinct<T>(IDbCommand dbCmd)
         {
             Filter(dbCmd);
             var results = GetColumnDistinctResults<T>(dbCmd) ?? GetColumnResults<T>(dbCmd);
-            return (from object result in results select (T)result).ToHashSet();
+            return (from object result in results select (T)result).ToSet();
         }
 
         public Dictionary<K, V> GetDictionary<K, V>(IDbCommand dbCmd)

src/ServiceStack.OrmLite/OrmLiteWriteCommandExtensions.cs

@@ -910,7 +910,7 @@ internal static void InsertUsingDefaults<T>(this IDbCommand dbCmd, params T[] ob
                 var fieldsWithoutDefaults = modelDef.FieldDefinitionsArray
                     .Where(x => x.DefaultValue == null)
                     .Select(x => x.Name)
-                    .ToHashSet(); 
+                    .ToSet(); 
 
                 dialectProvider.PrepareParameterizedInsertStatement<T>(dbCmd,
                     insertFields: fieldsWithoutDefaults);