Add Stevenjin8 as a maintainer

[Stevenjin8]

Checklist for maintainer updates

• https://github.com/istio/community/blob/2fb13ef912c823a3f100625c89728f25248e8a33/org/teams.yaml#L11-L53

• 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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[Stevenjin8]

@idvoretskyi