[Snyk] Upgrade @snyk/cli-interface from 2.3.2 to 2.6.1

Snyk has created this PR to upgrade @snyk/cli-interface from 2.3.2 to 2.6.1.

merge advice

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:information_source: Keep your dependencies up-to-date. This makes it easier to fix existing vulnerabilities and to more quickly identify and fix newly disclosed vulnerabilities when they affect your project.

The recommended version is 4 versions ahead of your current version.
The recommended version was released a month ago, on 2020-04-30.

Release notes

Package name: @snyk/cli-interface

2.6.1 - 2020-04-30
2.6.1 (2020-04-30)

Bug Fixes
- set min node 8 (7133e37)
2.6.0 - 2020-04-30
2.6.0 (2020-04-30)

Features
- make graphlib a prod dep (42aeb11)
2.5.0 - 2020-04-30
2.5.0 (2020-04-30)

Features
- use patched lib & add types (3f20454)
2.4.0 - 2020-04-19
2.4.0 (2020-04-19)

Features
- add call graph type to scanned project payload (be83648)
2.3.2 - 2020-02-20
2.3.2 (2020-02-20)

Bug Fixes
- added packageFormatVersion to PluginMetadata Interface. (96f3efd)