Bump NUnit and Verify.NUnit (#2365)

Bumps [NUnit](https://github.com/nunit/nunit) and [Verify.NUnit](https://github.com/VerifyTests/Verify). These dependencies needed to be updated together.

Updates `NUnit` from 4.2.2 to 4.2.2
- [Release notes](https://github.com/nunit/nunit/releases)
- [Changelog](https://github.com/nunit/nunit/blob/main/CHANGES.md)
- [Commits](nunit/nunit@4.2.2...4.2.2)

Updates `Verify.NUnit` from 28.1.2 to 28.3.2
- [Release notes](https://github.com/VerifyTests/Verify/releases)
- [Commits](VerifyTests/Verify@28.1.2...28.3.2)

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

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Dylan Perks <[email protected]>

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

@@ -15,7 +15,7 @@
     <PackageReference Include="Silk.NET.BuildTools" Version="2.22.0" />
     <PackageReference Include="System.Linq.Async" Version="6.0.1" />
     <PackageReference Include="Verify.DiffPlex" Version="3.1.2" />
-    <PackageReference Include="Verify.NUnit" Version="28.3.0" />
+    <PackageReference Include="Verify.NUnit" Version="28.3.2" />
     <None Include="**/*.received.*" />
     <None Include="**/*.verified.*" />
   </ItemGroup>