Update KubeFleet maintainers

[sjwaight]

Checklist for maintainer updates

See updated list (approved) on main kubefleet repo: - https://github.com/kubefleet-dev/kubefleet/blob/main/MAINTAINERS.md.

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.
• 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.

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[riaankleinhans]

@sjwaight can you please sign your commit ?

[riaankleinhans]

@sjwaight can you please also add Stéphane Erbrech to the project's maintainers file?

[sjwaight]

@riaankleinhans

1. Signed commit.
2. Pending PR approval and merge for Stephane: chore: update maintainers kubefleet-dev/kubefleet#608

[sjwaight]

@riaankleinhans PR has merged and Stephane is now listed in maintainers.