[Bug]: When creating new segment always getting null exception.

[mozbayrak]

What happened?

Although I set name property of segment I getting null exception.

My code is below:

        public void CreateSegment(string segmentName)
        {
            Segment newSegment = new()
            {
                Name = segmentName
            };
            var filterItem = new FilterExpressions(new Filter(field: "user_tag", relation: Filter.RelationEnum.Equal, value: segmentName));
            newSegment.Filters.Add(filterItem);

            _appInstance.CreateSegments(appId: _appId, segment: newSegment);
        }

SS attachment

![one_signal_create_segment](https://github.com/OneSignal/onesignal-dotnet-api/assets/105269510/e629b655-aed8-43fd-be58-d9cac4c5b004)

Steps to reproduce?

1. Installed RestSharp v108.0.3
2. Installed OneSignal Api v2.0.2

What did you expect to happen?

I expected to create new segment

Relevant log output

No response

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