fix: nuget plugin writes messages to stderr

[37IulianPopovici]

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What does this PR do?

Updated snyk-nuget-plugin in order to fix a bug where the usage of --json and --dotnet-runtime-resolution will produce invalid JSON output due to the user messages displayed by the plugin. The plugin was updated to write it's user facing messages to stderr instead of stdout.

No risk, this is a bug fix.

snyk/snyk-nuget-plugin#217
snyk/snyk-nuget-plugin#218

Where should the reviewer start?

How should this be manually tested?

Use this fixture and do a scan with --dotnet-runtime-resolution and --json.

Any background context you want to provide?

#5358

What are the relevant tickets?

Screenshots

Additional questions

[cmars]

Thanks for this!