Bump System.IO.Abstractions.TestingHelpers from 16.1.10 to 19.2.1 in /source/tests/data-mapper-test#184
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dependabot[bot] wants to merge 1 commit intomainfrom dependabot/nuget/source/tests/data-mapper-test/System.IO.Abstractions.TestingHelpers-19.2.1
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