Update ScannerVersion to match spotbugs version

What does this MR do?

The version of spotbugs was updated to v4.9.1 as part of Update build tools to latest versions, however, the metadata.ScannerVersion was not updated to match this new version. This MR fixes this discrepancy.

What are the relevant issue numbers?

No issue number

Does this MR meet the acceptance criteria?

• Changelog entry added
• Documentation created/updated for GitLab EE, if necessary
• Documentation created/updated for this project, if necessary
• Documentation reviewed by technical writer or follow-up review issue created
• Tests added for this feature/bug
• Job definition updated, if necessary
  • Auto-DevOps template (also in CE)
  • Job definition example
  • CI Templates (to be removed)
  • Vendored CI Templates (also in CE)
• Conforms to the code review guidelines
• Conforms to the Go guidelines
• Security reports checked/validated by reviewer