chore: fix core team members (#60900)
### What?
Removing an outdated entry, and fixing the casing of another so Workflow
runs are auto-approved.
### Why?
https://github.com/vercel/next.js/pull/60574 fails the CI Workflow Run,
because of a mismatch in GitHub actor and the actual username set in
`labeler.json`
[Ref](https://github.com/vercel/nextjs-hive-docker/blob/c26bc3f26520b41986a0f9467fdc2529f705d81f/validate-job.js#L39-L42),
[Slack
thread](https://vercel.slack.com/archives/C03S9JCH2Q5/p1705684536884389?thread_ts=1705436555.494229&cid=C03S9JCH2Q5)
Closes NEXT-2172
