Fixed JsonSerializer respects set Culture when deserializing primitive type (#1606)

Co-authored-by: Jiri Muller <george6279@seznam.cz>

Author: Georgiks

src/RestSharp/Extensions/ReflectionExtensions.cs

@@ -62,6 +62,8 @@ public static bool IsSubclassOfRawGeneric(this Type toCheck, Type generic)
             return false;
         }
 
+        internal static object ChangeType(this object source, Type newType, IFormatProvider provider) => Convert.ChangeType(source, newType, provider);
+        
         internal static object ChangeType(this object source, Type newType) => Convert.ChangeType(source, newType);
 
         /// <summary>

src/RestSharp/Serializers/Json/JsonSerializer.cs

@@ -236,7 +236,7 @@ object ConvertValue(TypeInfo typeInfo, object value)
             }
 
             var type = typeInfo.AsType();
-            if (typeInfo.IsPrimitive) return value.ChangeType(type);
+            if (typeInfo.IsPrimitive) return value.ChangeType(type, Culture);
 
             if (typeInfo.IsEnum) return type.FindEnumValue(stringValue, Culture);