Add Omer to maintainers

[omerap12]

Checklist for maintainer updates

ref: kubernetes/community#8999

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.

[netlify]

✅ Deploy Preview for cncf-license-exceptions canceled.

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[riaankleinhans]

https://github.com/kubernetes/org/pull/6423/changes