Bump APIApproval test dependencies

Author: michaelklishin

projects/Unit/APIApproval.cs

@@ -47,7 +47,6 @@ public Task Approve()
             string publicApi = typeof(ConnectionFactory).Assembly.GeneratePublicApi(new ApiGeneratorOptions { ExcludeAttributes = new[] { "System.Runtime.Versioning.TargetFrameworkAttribute" } });
 
             var settings = new VerifySettings();
-            settings.DisableClipboard();
             settings.DisableDiff();
 
             return Verifier.Verify(publicApi, settings);

projects/Unit/Unit.csproj

@@ -13,10 +13,10 @@
   <ItemGroup>
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="16.7.1" />
     <PackageReference Include="Microsoft.NETFramework.ReferenceAssemblies" Version="1.0.0" />
-    <PackageReference Include="NUnit" Version="3.12.0" />
+    <PackageReference Include="NUnit" Version="3.13.2" />
     <PackageReference Include="NUnit3TestAdapter" Version="3.17.0" />
     <PackageReference Include="PublicApiGenerator" Version="10.2.0" />
-    <PackageReference Include="Verify.NUnit" Version="6.9.0" />
+    <PackageReference Include="Verify.NUnit" Version="11.18.2" />
   </ItemGroup>
 
 </Project>