ci: Replace deprecated variable for disabling default analyzers

What does this MR do?

Replaces deprecated variable for disabling default analyzers.

• https://docs.gitlab.com/ee/update/removals.html#dependency-scanning
• https://docs.gitlab.com/ee/user/application_security/dependency_scanning/analyzers.html#disabling-default-analyzers

Dogfoods ~"Category:Dependency Scanning".

What are the relevant issue numbers?

Part of gitlab-org/gitlab#365109

Does this MR meet the acceptance criteria?

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