Update kubefleet maintainers

[sjwaight]

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. See updated maintainers list: https://github.com/kubefleet-dev/kubefleet/blob/main/MAINTAINERS.md
• The maintainer(s) also created or updated their LFX Individual Dashboard profile.
• 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.

[riaankleinhans]

@sjwaight thank you for the update. Can you please also update https://github.com/kubefleet-dev/.project/blob/main/maintainers.yaml
This will auto add / remove maintainer from the project maintainers mailing list and CNCF Service desk.

In the next moth this list would be also auto maintained from the projects /.project/maintainers.yaml