Remove self as database reviewer

Why is this change being made?

After reading some docs, I realized, I missed some process steps for becoming a database reviewer and would like to go through that in the future, but I'll remove myself for now.

https://docs.gitlab.com/ee/development/database/database_reviewer_guidelines.html#how-to-apply-for-becoming-a-database-reviewer

Author Checklist

• Correct MR template applied (e.g blog post)
• Provided a concise title for the MR
• Added a description to this MR explaining the reasons for the proposed change, per say-why-not-just-what
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