Switch to licence expression

[thompson-tomo]

Problem Description

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

Proposed Solution

The nuget package should be using a license expression.

Use Case

Browing of nuget.org

Impact Level

Medium: Significant usability enhancement

Alternative Solutions

No response

Additional Considerations

• This feature would be useful for multiple users/scenarios
• I have checked that this feature request doesn't already exist

[github-actions]

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[Taiizor]

This issue will be resolved after the next package release.

[thompson-tomo]

@Taiizor if you are referring to the change in bb4db78 that doesn't fix it hence i have just created #53 to address it.