Bump Verify.NUnit and NUnit

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 26.4.0
- [Release notes](https://github.com/VerifyTests/Verify/releases)
- [Commits](VerifyTests/Verify@25.3.2...26.4.0)

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]>

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="4.5.0" />
  </ItemGroup>
 

tests/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="26.4.0" />
  <None Include="**/*.received.*" />
  <None Include="**/*.verified.*" />
  </ItemGroup>