Bump Verify.Xunit from 26.6.0 to 28.4.0 in /src

Bumps [Verify.Xunit](https://github.com/VerifyTests/Verify) from 26.6.0 to 28.4.0.
- [Release notes](https://github.com/VerifyTests/Verify/releases)
- [Commits](VerifyTests/Verify@26.6.0...28.4.0)

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

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

src/Tests/Tests.csproj

@@ -9,7 +9,7 @@
     <PackageReference Include="Xunit" Version="2.9.2" />
     <PackageReference Include="XunitContext" Version="3.3.2" />
     <PackageReference Include="MarkdownSnippets.MsBuild" Version="27.0.2" />
-    <PackageReference Include="Verify.Xunit" Version="26.6.0" />
+    <PackageReference Include="Verify.Xunit" Version="28.4.0" />
     <ProjectReference Include="..\HandlerOrdering\NServiceBus.HandlerOrdering.csproj" />
     <PackageReference Include="ProjectDefaults" Version="1.0.147" PrivateAssets="all" />
   </ItemGroup>