refs and cleanup

Author: SimonCropp

src/Directory.Packages.props

@@ -17,6 +17,6 @@
     <PackageVersion Include="System.ValueTuple" Version="4.6.1" />
     <PackageVersion Include="System.Runtime" Version="4.3.1" />
     <PackageVersion Include="System.Runtime.InteropServices.RuntimeInformation" Version="4.3.0" />
-    <PackageVersion Include="Microsoft.Sbom.Targets" Version="3.1.0" />
+    <PackageVersion Include="Microsoft.Sbom.Targets" Version="4.0.2" />
   </ItemGroup>
 </Project>