[21267] Fix weekly CI cron expression

[JesusPoderoso]

Description

The cron expression was overlooked during the review so the CI that was supposed to be run only at 00:00 on Mondays it is being triggered every hour in Monday.

Contributor Checklist

• Commit messages follow the project guidelines.
• N/A Code snippets related to the added documentation have been provided.
• N/A Documentation tests pass locally.
• N/A Applicable backports have been included in the description.

Reviewer Checklist

• The PR has a milestone assigned.
• The title and description correctly express the PR's purpose.
• N/A Check contributor checklist is correct.
• N/A CI passes without warnings or errors.