Bump Verify.Xunit from 20.4.0 to 20.6.0 (#6848)

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>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

src/core/Akka.API.Tests/Akka.API.Tests.csproj

@@ -28,7 +28,7 @@
     <PackageReference Include="xunit" Version="$(XunitVersion)" />
     <PackageReference Include="xunit.runner.visualstudio" Version="$(XunitVersion)" />
     <PackageReference Include="PublicApiGenerator" Version="9.3.0" />
-    <PackageReference Include="Verify.Xunit" Version="20.4.0" />
+    <PackageReference Include="Verify.Xunit" Version="20.6.0" />
     <PackageReference Include="Verify.DiffPlex" Version="2.2.1" />
   </ItemGroup>