Update gitlab-api dependency

[zbynek]

Downstream of jenkinsci/gitlab-api-plugin#121 -- changes some inports to fit the new API.

See also https://issues.jenkins.io/browse/JENKINS-76091

Testing done

Checked that together with the upstream PR and a hack to add jersey3-api dependency to that plugin this resolves the issue of authentication not working with Jackson plugin v 2.20.0.

Submitter checklist

• Make sure you are opening from a topic/feature/bugfix branch (right side) and not your main branch!
• Ensure that the pull request title represents the desired changelog entry
• Please describe what you did
• Link to relevant issues in GitHub or Jira
• Link to relevant pull requests, esp. upstream and downstream changes
• [n/a] Ensure you have provided tests that demonstrate the feature works or the issue is fixed