[Snyk] Security upgrade Microsoft.NET.Test.Sdk from 17.2.0-preview-20220401-08 to 17.4.0

[snyk-bot]

Snyk has created this PR to fix one or more vulnerable packages in the `nuget` dependencies of this project.

Changes included in this PR

• Changes to the following files to upgrade the vulnerable dependencies to a fixed version:
  • VisualPinball.Unity/VisualPinball.Unity.Test/VisualPinball.Unity.Test.csproj

Vulnerabilities that will be fixed

With an upgrade:

Severity	Priority Score (*)	Issue	Breaking Change	Exploit Maturity
	696/1000 Why? Proof of Concept exploit, Has a fix available, CVSS 7.5	Insecure Defaults SNYK-DOTNET-NEWTONSOFTJSON-2774678	No	Proof of Concept

(*) Note that the real score may have changed since the PR was raised.

Check the changes in this PR to ensure they won't cause issues with your project.

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