Bump Verify.Xunit from 20.0.0 to 20.1.1 in /src (#348)

Author: dependabot[bot]

src/DiffEngineTray.Tests/DiffEngineTray.Tests.csproj

@@ -10,7 +10,7 @@
     <PackageReference Include="Argon" Version="0.7.1" />
     <PackageReference Include="Verify.DiffPlex" Version="2.2.1" />
     <PackageReference Include="Verify.WinForms" Version="4.0.0" />
-    <PackageReference Include="Verify.Xunit" Version="20.0.0" />
+    <PackageReference Include="Verify.Xunit" Version="20.1.1" />
     <PackageReference Include="Verify.ImageMagick" Version="3.2.2" />
     <PackageReference Include="Xunit" Version="2.4.2" />
     <PackageReference Include="xunit.runner.visualstudio" Version="2.4.5" PrivateAssets="all" />