chore: update Open Cluster Management maintainers list

[mikeshng]

Pre-submission checklist

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

• The maintainer has updated their LFX Individual Dashboard profile.
• You've 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 updates to cncf/gitdm.

[mikeshng]

CC @qiujian16 @jaswalkiranavtar @jeffw17 @ramekris3163

[krook]

Thanks @mikeshng

@jeffw17 and @ramekris3163 have been added to the CNCF maintainer list, and Service Desk (Jira), and the OCM maintainer mailing list.