refactor: use unauthenticated auth source from GitLab client-go

Timo Furrerrequested to merge
use-unauthenticated-auth-source into main

Description

  • refactor: use unauthenticated auth source from GitLab client-go

This refactoring includes the new unauthenticated auth source from gitlab-org/api/client-go!2761 (merged)

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