Add support for nuget version 2 lock files

What does this MR do and why?

Updates documentation to state that Gitlab's Dependency Scanning now supports nuget lock files of version 2.

Relates to Add support for Version 2 of Nuget's packages.l... (#398680 - closed)

Screenshots or screen recordings

Not applicable

How to set up and validate locally

You can run dependency scanning on a project with a nuget v2 lock file

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

• I have evaluated the MR acceptance checklist for this MR.