Bump NUnit from 3.14.0 to 4.2.2 in /src

Bumps [NUnit](https://github.com/nunit/nunit) from 3.14.0 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@v3.14.0...4.2.2)

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

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

Author: dependabot[bot]

src/ServiceControl.Contracts.Tests/ServiceControl.Contracts.Tests.csproj

@@ -11,7 +11,7 @@
   <ItemGroup>
     <PackageReference Include="GitHubActionsTestLogger" Version="2.4.1" />
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.11.0" />
-    <PackageReference Include="NUnit" Version="4.2.1" />
+    <PackageReference Include="NUnit" Version="4.2.2" />
     <PackageReference Include="NUnit3TestAdapter" Version="4.6.0" />
     <PackageReference Include="PublicApiGenerator" Version="11.1.0" />
     <PackageReference Include="Particular.Approvals" Version="2.0.0" />