chore(bootc): Update bootc maintainers

[nimbinatus]

Per bootc-dev/bootc#1538, updating the maintainer list for bootc.

Pre-submission checklist for maintainer updates (delete this if you're updating a different file)

If you're adding a new maintainer to the CSV file, please review each of these actions as well:

• You've provided a link to documentation where the project has approved the maintainer change.
  • governance: add community manager role bootc-dev/bootc#1538
• The maintainer has also created or updated their LFX Individual Dashboard profile.
• You've also sent an email with the addresses to [email protected] for access to Service Desk and mailing lists.
• Optional: You've also sent a PR with affiliation updates to cncf/gitdm.

[krook]

Thank you @nimbinatus. You've been added to our records and granted access to Service Desk (Jira) and the maintainer mailing list (groups.io).

[nimbinatus]

Thanks, @krook ! Appreciate it!