Add pboyd to Kubeflow maintainers

[pboyd]

Checklist for maintainer updates

Note

Delete this template if you're not changing the CSV file

• You've provided a link to documentation where the project has approved the maintainer changes.
  • chore: add myself as an approver kubeflow/model-registry#1756
  • https://github.com/kubeflow/internal-acls/blob/master/github-orgs/kubeflow/org.yaml#L809 (add kubeflow-hub-team with Write to KF/model-registry kubeflow/internal-acls#882)
• The maintainer(s) also created or updated their LFX Individual Dashboard profile.
  • https://openprofile.dev/profile/paulboyd
• You've sent an email with the list of email address(es) to cncf-maintainer-changes@cncf.io for invitations to Service Desk and mailing lists. You can just mark this complete if you are only removing people.
• Optional: You've also sent a PR with affiliation updates to cncf/gitdm.