chore: upgrade pgx to v5.9.0 to remediate CVE-2026-33815 and CVE-2026-33816 BED-7930

[elikmiller]

Description

• Upgraded github.com/jackc/pgx/v5 from v5.8.0 to v5.9.0
• Remediates critical CVEs identified by Docker Scout

Motivation and Context

BED-7930

How Has This Been Tested?

• All CI tests continue to pass

Types of changes

• Chore (a change that does not modify the application functionality)

Checklist:

• I have met the contributing prerequisites
  • Assigned myself to this PR
  • Added the appropriate labels
  • Associated an issue: Issues and Pull Requests README #672
  • Read the Contributing guide: https://github.com/SpecterOps/BloodHound/wiki/Contributing
• I have ensured that related documentation is up-to-date
  • Open API docs
  • Code comments (GoDocs / JSDocs)
• I have followed proper test practices
  • Added/updated tests to cover my changes
  • All new and existing tests passed

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch BED-7930-upgrade-pgx-to-v5.9

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