Fix detection, parsing of npm-shrinkwrap.json files

What does this MR do?

Update analyzers/gemnasium/v2 dependency so that it detect npm-shrinkwrap.json files.

What are the relevant issue numbers?

none

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
• [-] Conforms to the code review guidelines
• [-] Conforms to the Go guidelines
• [-] Security reports checked/validated by reviewer