Bump the finalize_after date of backfill migration

What does this MR do and why?

It bumps the finalize_after date of the backfill_vs_code _settings_uuid migration because it was released too close to the original finalize_after value.

Screenshots or screen recordings

This MR does not introduce user-facing changes.

How to set up and validate locally

There aren't behavioral changes in this MR.

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

• I have evaluated the MR acceptance checklist for this MR.

Related to #432992 (closed)