[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 The added tests pass locally.
• N/A Changes are backwards compatible.
• N/A New feature has been documented/Current behavior is correctly described in the documentation.
• 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.
• Check contributor checklist is correct.
• N/A Check CI results: changes do not issue any warning.
• N/A Check CI results: failing tests are unrelated with the changes.