chore(deps): bump Verify.Xunit from 28.2.0 to 28.6.1

Bumps [Verify.Xunit](https://github.com/VerifyTests/Verify) from 28.2.0 to 28.6.1.
- [Release notes](https://github.com/VerifyTests/Verify/releases)
- [Commits](VerifyTests/Verify@28.2.0...28.6.1)

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

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

Author: dependabot[bot]

test/Microsoft.OpenApi.Tests/Microsoft.OpenApi.Tests.csproj

@@ -15,7 +15,7 @@
     <PackageReference Include="Moq" Version="4.20.72" />
     <PackageReference Include="Newtonsoft.Json" Version="13.0.3" />
     <PackageReference Include="SharpYaml" Version="2.1.1" />
-    <PackageReference Include="Verify.Xunit" Version="28.2.0" />
+    <PackageReference Include="Verify.Xunit" Version="28.6.1" />
     <PackageReference Include="xunit" Version="2.9.2" />
     <PackageReference Include="xunit.runner.visualstudio" Version="2.8.2" PrivateAssets="all" />
     <PackageReference Include="Microsoft.CSharp" Version="4.7.0" />