feat: uses async request instead of Task.Run

Author: bednar

Client.Legacy/FluxClient.cs

@@ -423,7 +423,7 @@ private async Task<IRestResponse> ExecuteAsync(RestRequest request)
         {
             BeforeIntercept(request);
 
-            var response = await Task.Run(() => RestClient.Execute(request)).ConfigureAwait(false);
+            var response = await RestClient.ExecuteAsync(request).ConfigureAwait(false);
 
             RaiseForInfluxError(response, response.Content);