Update file vulnerability_scanner_maintenance.md

What does this MR do and why?

Update the Dependency Scanner maintenance page which states that GLAD is updated daily so that is in sync with the GitLab Advisory DB page that states that updates happen hourly.

References

Internal only (https://gitlab.slack.com/archives/CKWHYU7U2/p1759343293427469)

Screenshots or screen recordings

Before After

How to set up and validate locally

MR acceptance checklist

Evaluate this MR against the MR acceptance checklist. It helps you analyze changes to reduce risks in quality, performance, reliability, security, and maintainability.

Merge request reports

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