Add jonburdo to Kubeflow Maintainers

[jonburdo]

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.
  • add jonburdo to approvers list kubeflow/model-registry#2162
  • add jonburdo to hub team kubeflow/internal-acls#889
• The maintainer(s) also created or updated their LFX Individual Dashboard profile.
  • https://openprofile.dev/profile/jonburdo
• 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.
  • sent
• Optional: You've also sent a PR with affiliation updates to cncf/gitdm.