Update Sbom to 0.3.1

Author: SimonCropp

src/Directory.Packages.props

@@ -8,7 +8,7 @@
     <PackageVersion Include="Microsoft.NET.Test.Sdk" Version="18.10.1" />
     <PackageVersion Include="Polyfill" Version="11.4.0" />
     <PackageVersion Include="ProjectDefaults" Version="1.0.181" />
-    <PackageVersion Include="Sbom" Version="0.2.0" />
+    <PackageVersion Include="Sbom" Version="0.3.1" />
     <PackageVersion Include="TestableIO.System.IO.Abstractions" Version="22.2.0" />
     <PackageVersion Include="TestableIO.System.IO.Abstractions.Wrappers" Version="22.2.0" />
     <PackageVersion Include="Verify" Version="33.1.4" />