Bump Verify.Nunit from 27.1.0 to 28.1.0 in /src

Bumps [Verify.Nunit](https://github.com/VerifyTests/Verify) from 27.1.0 to 28.1.0.
- [Release notes](https://github.com/VerifyTests/Verify/releases)
- [Commits](VerifyTests/Verify@27.1.0...28.1.0)

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

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

src/Directory.Packages.props

@@ -11,6 +11,6 @@
     <PackageVersion Include="NUnit3TestAdapter" Version="4.6.0" />
     <PackageVersion Include="Polyfill" Version="7.2.0" />
     <PackageVersion Include="ProjectDefaults" Version="1.0.141" />
-    <PackageVersion Include="Verify.Nunit" Version="27.1.0" />
+    <PackageVersion Include="Verify.Nunit" Version="28.1.0" />
   </ItemGroup>
 </Project>