Update Vitess maintainers

[deepthi]

Removing @deepthi for Vitess. See vitessio/vitess#18462

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:

• The maintainer has also created or updated their LFX Individual Dashboard profile.
• You've also sent an email with the addresses to cncf-maintainer-changes@cncf.io for access to Service Desk and mailing lists.
• Optional: You've also sent a PR with affiliation updates to cncf/gitdm.

[krook]

Looks like https://github.com/vitessio/vitess/blob/master/MAINTAINERS.md needs an update as well.

[krook]

Looks like https://github.com/vitessio/vitess/blob/master/MAINTAINERS.md needs an update as well.

Ah, nevermind. I see the pending PRs.

[krook]

Thank you for your contributions @deepthi! Removed from Service Desk and the maintainer lists. Please have someone from Vitess open up a new SD ticket if the GitHub Copilot issue still exists.