Bump Verify.NUnit from 23.0.1 to 23.1.0 in /src

Bumps [Verify.NUnit](https://github.com/VerifyTests/Verify) from 23.0.1 to 23.1.0.
- [Release notes](https://github.com/VerifyTests/Verify/releases)
- [Commits](VerifyTests/Verify@23.0.1...23.1.0)

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

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

src/Tests/Tests.csproj

@@ -11,7 +11,7 @@
     <PackageReference Include="Verify.Phash" Version="3.1.0" />
     <PackageReference Include="NUnit" Version="4.0.1" />
     <PackageReference Include="NUnit3TestAdapter" Version="4.5.0" />
-    <PackageReference Include="Verify.NUnit" Version="23.0.1" />
+    <PackageReference Include="Verify.NUnit" Version="23.1.0" />
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.8.0" />
     <PackageReference Include="ProjectDefaults" Version="1.0.109" PrivateAssets="all" />
     <ProjectReference Include="..\Verify.WinForms\Verify.WinForms.csproj" />