feat: update Credential Format extension point for vc+sd-jwt

[nanderstabel]

Description of change

Bump identity_credential to v1.9.1-beta.1

• Updated Credential Profile extension for vc+sd-jwt according to what is defined in this PR.

Links to any relevant issues

n/a

How the change has been tested

See:

• feat: issue SD-JWT VC credentials ssi-agent#278

Definition of Done checklist

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• 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.

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