Add a more recent TFM to eliminate dependency

[thompson-tomo]

Describe the feature.

I want my application's and libraries to be as small as possible and the minimum amount of dependencies.

Is your feature related to a problem?

Additional dependencies are being added to my projects.

Describe the requested feature

When the framework is able to natively provide a dependency ie System.* that should be utilised rather than an explicit dependency. This will be the case for the net standard 2.1

Describe alternatives you've considered

Accept the additional dependencies

Additional Context

No response