Add nuspec deps

## Describe the task

Nuspec does not list it's deps but requires some, e.g. compilerservices.runtime.unsafe

## Area

N/A

## Completed When

- [ ] all deps listed
- [ ] nuget version updated

## Additional context

https://docs.microsoft.com/en-us/nuget/reference/nuspec#dependencies-element
https://docs.microsoft.com/en-us/nuget/concepts/package-versioning#version-ranges