Bump Verify.NUnit and NUnit (#2339)

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

Updates `Verify.NUnit` from 25.3.2 to 28.1.2
- [Release notes](https://github.com/VerifyTests/Verify/releases)
- [Commits](VerifyTests/Verify@25.3.2...28.1.2)

Updates `NUnit` from 4.1.0 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@4.1.0...4.2.2)

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

Directory.Build.targets

@@ -18,7 +18,7 @@
   <!-- Package versions for package references across all projects -->
   <ItemGroup>
     <PackageReference Update="Microsoft.NET.Test.Sdk" Version="17.10.0" />
-    <PackageReference Update="NUnit" Version="4.1.0" />
+    <PackageReference Update="NUnit" Version="4.2.2" />
     <PackageReference Update="NUnit3TestAdapter" Version="4.6.0" />
   </ItemGroup>
 

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

@@ -11,11 +11,11 @@
   </ItemGroup>
 
   <ItemGroup>
-    <PackageReference Update="NUnit" Version="4.1.0" />
+    <PackageReference Update="NUnit" Version="4.2.2" />
     <PackageReference Include="Silk.NET.BuildTools" Version="2.21.0" />
     <PackageReference Include="System.Linq.Async" Version="6.0.1" />
     <PackageReference Include="Verify.DiffPlex" Version="3.0.0" />
-    <PackageReference Include="Verify.NUnit" Version="25.3.2" />
+    <PackageReference Include="Verify.NUnit" Version="28.1.2" />
     <None Include="**/*.received.*" />
     <None Include="**/*.verified.*" />
   </ItemGroup>