feat: Removes the useImprovedDotnetWithoutRestore flag

[calhar-snyk]

Pull Request Submission Checklist

• Follows CONTRIBUTING guidelines
• Commit messages
  are release-note ready, emphasizing
  what was changed, not how.
• Includes detailed description of changes
• Contains risk assessment (Low)
• Highlights breaking API changes (if applicable)
• Links to automated tests covering new functionality
• Includes manual testing instructions (if necessary)
• Updates relevant GitBook documentation (PR link: ___)
• Includes product update to be announced in the next stable release notes

What does this PR do?

This upgrades snyk-nuget-plugin to v4.1.0 which has the option useImprovedDotnetWithoutPublish removed and treated as true after a staged rollout completed.
This option was removed in snyk/snyk-nuget-plugin#280

Where should the reviewer start?

How should this be manually tested?

What's the product update that needs to be communicated to CLI users?

Any background context you want to provide?

What are the relevant tickets?

• OSE-214 -- Removal ticket
• OSE-119 -- Previous rollout ticket