Bump versions to work with ASP .NET Core 6 / .NET 6

[isaacabraham]

Is your feature request related to a problem?

Yes. Trying to add Fable.SignalR.Saturn (and therefore .AspNetCore) with Saturn 0.16.x / Giraffe 6.x doesn't work:

 - Fable.SignalR.AspNetCore 0.11.5 requested package System.Text.Encodings.Web: >= 5.0 < 6.0
 - System.Text.Json 6.0.2 requested package System.Text.Encodings.Web: >= 6.0
 - Microsoft.ApplicationInsights.Profiler.Core 2.3.1 requested package system.text.encodings.web: >= 5.0.1

Describe the solution you'd like

If System.Text.Encodings.Web supported 6.x as well, this issue might go away (I suspect that there may be other deps that also need promoting).

Describe alternatives you've considered

Downgrading our project to .NET 5, but this would be highly undesirable.

[rastreus]

@isaacabraham There's currently an open PR to support .NET 6 (#36) for Fable.SignalR.

I opened a PR to fix Feliz.UseWorker (Shmew/Feliz.UseWorker#3) months ago. I've noticed that @Shmew has been absent from GitHub activity as well as the #fsharp community on Twitter for some time now. It seems like the projects may be abandoned?

I don't know the process, but the F# community might want to fork and put the projects under fsprojects.