chore(deps): update dependency microsoft.reactive.testing to 6.1.0#1604

JoeRobich merged 1 commit intomasterOmniSharp/csharp-language-server-protocol:masterfrom

renovate/microsoft.reactive.testing-6.xOmniSharp/csharp-language-server-protocol:renovate/microsoft.reactive.testing-6.xCopy head branch name to clipboard