Merge pull request #1186 from dotnet/dependabot/nuget/Rx.NET/Source/Verify.Xunit-1.28.3

Author: dependabot-preview[bot]

Rx.NET/Source/tests/Tests.System.Reactive.ApiApprovals/Tests.System.Reactive.ApiApprovals.csproj

@@ -26,7 +26,7 @@
 
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     <PackageReference Include="xunit" Version="2.4.1" />
     <PackageReference Include="xunit.runner.visualstudio" Version="2.4.1" />
     <PackageReference Include="DiffPlex" Version="1.6.1" />