SASTBot: Monthly dependency updates for 16.4

What does this MR do?

• upgrade Gitleaks version [8.17.0 => 8.18.0]
• upgrade gitlab.com/gitlab-org/security-products/analyzers/ruleset/v2 version [v2.0.5 => v2.0.6]

CHANGELOG is generated by SASTBot.

What are the relevant issue numbers?

• https://gitlab.com/gitlab-org/security-products/release/-/issues/140+

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
  • Job definition example
  • CI Templates
• Conforms to the code review guidelines
• Conforms to the Go guidelines
• Security reports checked/validated by reviewer