Document sbt support for dependency scanning

What does this MR do?

This MR documents the addition of sbt support for dependency scanning.

Does this MR meet the acceptance criteria?

Conformity

• Changelog entry
• Documentation (if required)
• [-] Code review guidelines
• [-] Merge request performance guidelines
• [-] Style guides
• [-] Database guides
• [-] Separation of EE specific content

Related #12390 (closed) gitlab-org/security-products/analyzers/gemnasium-maven!20 (merged)