Bump System.IO.Abstractions.TestingHelpers from 13.2.10 to 19.2.1 in /src/Dash/test/Dash.Tests#468

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dependabot/nuget/src/Dash/test/Dash.Tests/System.IO.Abstractions.TestingHelpers-19.2.1dotnet-dash/dash:dependabot/nuget/src/Dash/test/Dash.Tests/System.IO.Abstractions.TestingHelpers-19.2.1Copy head branch name to clipboard