Bump Verify.NUnit and NUnit in /tests/NHapi.NUnit.SourceGeneration

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 26.2.0 to 26.4.2
- [Release notes](https://github.com/VerifyTests/Verify/releases)
- [Commits](VerifyTests/Verify@26.2.0...26.4.2)

Updates `NUnit` from 4.2.1 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@4.2.1...4.2.2)

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

Signed-off-by: dependabot[bot] <[email protected]>

tests/NHapi.NUnit.SourceGeneration/NHapi.NUnit.SourceGeneration.csproj

@@ -15,7 +15,7 @@
   </ItemGroup>
 
   <ItemGroup>
-    <PackageReference Include="NUnit" Version="4.2.1" />
+    <PackageReference Include="NUnit" Version="4.2.2" />
     <PackageReference Include="NUnit3TestAdapter" Version="4.6.0" />
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.11.0" />
     <PackageReference Include="coverlet.collector" Version="6.0.2">
@@ -27,7 +27,7 @@
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
     </PackageReference>
     <PackageReference Include="Microsoft.Extensions.Configuration.Json" Version="8.0.0" />
-    <PackageReference Include="Verify.NUnit" Version="26.2.0" />
+    <PackageReference Include="Verify.NUnit" Version="26.4.2" />
   </ItemGroup>
 
   <ItemGroup>