Switch to license expression

[thompson-tomo]

Is your feature request related to a problem? Please describe.

The licence type is not being populated on nuget.org & in the sbom.

Describe the solution you'd like

The nuget package should be using a license expression with a compound assignment.

Describe alternatives you've considered

No response

Additional context

No response

[Gsantomaggio]

Thank you for raising the issue @thompson-tomo
We will have a look as soon as possible.
Feel free to propose a PR btw !

[thompson-tomo]

@Gsantomaggio i have taken a shot at it via #120 where I believe I used the right operator.