Optimise dependencies based on TFM

[thompson-tomo]

Is your feature request related to a problem?

I want to minimise dependencies in my project by utilising framework dependencies wherever possible

What solution would you like?

I want Microsoft.CSharp to no longer be an explicit dependency on net 6+

Describe alternatives you've considered

Accept the additional dependency

Additional context

No response

[charlessolar]

Thanks for the PRs to fix these issues - I will review this one more deeply, probably need to update most package versions and confirm no breaking changes.

[thompson-tomo]

No worries at all