Upgrade dependencies for node 12 compatibility

What does this MR do?

Upgrade dependencies for node 12 compatibility

Some dependencies have incompatibilities with Node v12, which will become LTS in October. Namely node-sass and fsevents needed to be forwarded in order for their native extensions to compile without errors.

Closes

• Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/61380
• Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/61631
• Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/61629

Does this MR meet the acceptance criteria?

Conformity

• Changelog entry
• Documentation created/updated or follow-up review issue created
• Code review guidelines
• Style guides