feat: use claude 4.0 sonnet for duo code review

What does this merge request do and why?

gitlab-org/gitlab#545502 (comment 2527955948)

update the claude version to 4.0 for duo code review

This MR should be reviewed together with gitlab-org/gitlab!192920 (merged)

How to set up and validate locally

Numbered steps to set up and validate the change are strongly suggested.

Merge request checklist

• Tests added for new functionality. If not, please raise an issue to follow up.
• Documentation added/updated, if needed.