refs and cleanup

Author: SimonCropp

src/Directory.Packages.props

@@ -11,6 +11,6 @@
     <PackageVersion Include="EmptyFiles" Version="8.17.2" />
     <PackageVersion Include="SimpleInfoName" Version="3.2.0" />
     <PackageVersion Include="Verify" Version="31.13.5" />
-    <PackageVersion Include="TUnit" Version="1.19.74" />
+    <PackageVersion Include="TUnit" Version="1.21.6" />
   </ItemGroup>
 </Project>