Bump Verify.NUnit from 23.6.0 to 23.7.1

Bumps [Verify.NUnit](https://github.com/VerifyTests/Verify) from 23.6.0 to 23.7.1.
- [Release notes](https://github.com/VerifyTests/Verify/releases)
- [Commits](https://github.com/VerifyTests/Verify/commits)

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

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

tests/SilkTouch/Silk.NET.SilkTouch.UnitTests.csproj

@@ -15,7 +15,7 @@
     <PackageReference Include="Silk.NET.BuildTools" Version="2.20.0" />
     <PackageReference Include="System.Linq.Async" Version="6.0.1" />
     <PackageReference Include="Verify.DiffPlex" Version="2.3.0" />
-    <PackageReference Include="Verify.NUnit" Version="23.6.0" />
+    <PackageReference Include="Verify.NUnit" Version="23.7.1" />
     <None Include="**/*.received.*" />
     <None Include="**/*.verified.*" />
   </ItemGroup>