Update DiffEngineTray.Tests.csproj

Author: SimonCropp

src/DiffEngineTray.Tests/DiffEngineTray.Tests.csproj

@@ -11,7 +11,7 @@
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     <PackageReference Include="Newtonsoft.Json" Version="12.0.3" />
     <PackageReference Include="Verify.WinForms" Version="2.3.0" />
-    <PackageReference Include="Verify.Xunit" Version="7.0.2" />
+    <PackageReference Include="Verify.Xunit" Version="8.0.0-beta.2" />
     <PackageReference Include="Verify.ImageMagick" Version="2.4.0" />
     <PackageReference Include="Xunit" Version="2.4.1" />
     <PackageReference Include="xunit.runner.visualstudio" Version="2.4.3" />