Add DS config for bundler audit advisory DB

What does this MR do?

This MR adds two new variables which allow dependency-scanning to configure the bundler-audit analyzer's ruby advisory db.

See: #37722 (closed)

Conformity

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