update greg nuget reference (package manager client)

[mjkkirschner]

Purpose

update package manager client reference to latest nuget to fix upload issue

Declarations

Check these if you believe they are true

• The code base is in a better state after this PR
• Is documented according to the standards
• The level of testing this PR includes is appropriate
• User facing strings, if any, are extracted into *.resx files
• All tests pass using the self-service CI.
• Snapshot of UI changes, if any.
• Changes to the API follow Semantic Versioning, and are documented in the API Changes document.

Reviewers

@scottmitchell

FYIs

@pinzart @smangarole

[scottmitchell]

LGTM

[mjkkirschner]

@smangarole FYI this is merged.