Updating dependency versions for .NET Isolated projects

[mattchenderson]

Moving package references to latest versions.

Extension packages referenced:

• [x] https://www.nuget.org/packages/Microsoft.Azure.Functions.Worker/1.21.0
• [x] https://www.nuget.org/packages/Microsoft.Azure.Functions.Worker.Extensions.CosmosDB/4.6.0
• [x] https://www.nuget.org/packages/Microsoft.Azure.Functions.Worker.Extensions.EventHubs/6.1.0
• [x] https://www.nuget.org/packages/Microsoft.Azure.Functions.Worker.Extensions.Http.AspNetCore/1.2.1
• [x] https://www.nuget.org/packages/Microsoft.Azure.Functions.Worker.Extensions.ServiceBus/5.16.0
• [x] https://www.nuget.org/packages/Microsoft.Azure.Functions.Worker.Extensions.SignalRService/1.13.0
• [x] https://www.nuget.org/packages/Microsoft.Azure.Functions.Worker.Extensions.Storage.Blobs/6.3.0
• [x] https://www.nuget.org/packages/Microsoft.Azure.Functions.Worker.Extensions.Storage.Queues/5.3.0
• [x] https://www.nuget.org/packages/Microsoft.Azure.Functions.Worker.Extensions.Storage/6.3.0
• [x] https://www.nuget.org/packages/Microsoft.Azure.Functions.Worker.Extensions.Tables/1.3.0
• [x] https://www.nuget.org/packages/Microsoft.Azure.Functions.Worker.ApplicationInsights/1.2.0