What did you expect to see?

There is no longer RestSharp dependency in Dynamo code base.

Details

Dynamo itself is depending on RestSharp for any RestAPI calls. This requires Dynamo aligning such version with Revit and package authors all the time.

Suggested solution:
Dynamo migrates from RestSharp to HttpClient (Built-in .NET) given HttpClient is the most common built-in replacement for RestSharp.