ci: Replace deprecated variable for excluding some analyzers

Replaces deprecated variable for disabling some default analyzers.

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

Dogfood ~"Category:Dependency Scanning"!

What are the relevant issue numbers?

Part of gitlab-org/gitlab#365109

Updates !169 (merged)

GitLab Docs MR

n/a as this MR is changing only pipeline typemaintenance maintenancepipelines.