feat: support depGraph, drop depTree and get correct project version

[anthogez]

• [x] Ready for review
• [x] Follows CONTRIBUTING rules
• [x] Reviewed by Snyk internal team

What does this PR do?

• Replace depTree with depGraph
• get correct project version

This PR depends of: https://github.com/snyk/snyk-cli-interface/pull/34 ✅

[snyksec]

:tada: This PR is included in version 3.5.0 :tada:

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

Your semantic-release bot :package::rocket: