Add additional TFM so the dependency on System.Threading.AccessControl can be removed

[thompson-tomo]

Is your feature request related to a problem? Please describe. I want to minimise dependencies in my project by utilising framework dependencies wherever possible

Describe the solution you'd like The System.Threading.AccessControl package becomes conditional so only added for the older frameworks

Describe alternatives you've considered Accept the additional dependency

Additional context n/a

[madelson]

@thompson-tomo would it be helpful to you if we offered net8 build without the dependency?

[thompson-tomo]

@madelson i now remember why i closed it. Which is that it is not part of the framework.