build: reference workspace license

[daniel-mader]

Description of change

oid4vc-core and oid4vc-manager were missing the license field.

Links to any relevant issues

n/a

How the change has been tested

n/a

Definition of Done checklist

Add an x to the boxes that are relevant to your changes.

• I have followed the contribution guidelines for this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
see 6 files with indirect coverage changes

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