Release for NET6

[m-carrasco]

Hi,

I think it could be useful to release a new version of Corral. master is now targeting NET6, and the latest release in NuGet targets NET5. If I understand correctly, just a new tag is required. This would be handy so dotnet tool install --global Corral works for NET6, and installing two runtimes is not required. The error message is:

You must install or update .NET to run this application.

App: /home/manuel/.dotnet/tools/corral
Architecture: x64
Framework: 'Microsoft.NETCore.App', version '5.0.0' (x64)
.NET location: /usr/share/dotnet

The following frameworks were found:
  6.0.8 at [/usr/share/dotnet/shared/Microsoft.NETCore.App]

Learn about framework resolution:
https://aka.ms/dotnet/app-launch-failed

To install missing framework, download:
https://aka.ms/dotnet-core-applaunch?framework=Microsoft.NETCore.App&framework_version=5.0.0&arch=x64&rid=ubuntu.20.04-x64

Best,
Manuel.