Bump Verify.Xunit from 20.4.0 to 20.6.0

Bumps [Verify.Xunit](https://github.com/VerifyTests/Verify) from 20.4.0 to 20.6.0.
- [Release notes](https://github.com/VerifyTests/Verify/releases)
- [Commits](VerifyTests/Verify@20.4.0...20.6.0)

---
updated-dependencies:
- dependency-name: Verify.Xunit
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

test/Tests.csproj

@@ -22,7 +22,7 @@
     </PackageReference>
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.6.3" />
     <PackageReference Include="Shouldly" Version="4.2.1" />
-    <PackageReference Include="Verify.Xunit" Version="20.4.0" />
+    <PackageReference Include="Verify.Xunit" Version="20.6.0" />
     <PackageReference Include="xunit" Version="2.4.2" />
     <PackageReference Include="xunit.runner.visualstudio" Version="2.4.5">
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>