refs or cleanup

Author: SimonCropp

src/Directory.Packages.props

@@ -10,6 +10,7 @@
     <PackageVersion Include="NUnit3TestAdapter" Version="5.2.0" />
     <PackageVersion Include="Polyfill" Version="9.3.0" />
     <PackageVersion Include="ProjectDefaults" Version="1.0.163" />
+    <PackageVersion Include="ProjectFiles" Version="0.1.2" />
     <PackageVersion Include="System.IO.Compression" Version="4.3.0" />
     <PackageVersion Include="System.Memory" Version="4.6.3" />
     <PackageVersion Include="System.Buffers" Version="4.6.1" />

src/Tests/Tests.csproj

@@ -8,6 +8,7 @@
     <PackageReference Include="NUnit" />
     <PackageReference Include="NUnit3TestAdapter" />
     <PackageReference Include="Microsoft.NET.Test.Sdk" />
+    <PackageReference Include="ProjectFiles" />
     <PackageReference Include="Verify.DiffPlex" />
     <PackageReference Include="Verify.Nunit" />
     <ProjectReference Include="..\DeterministicIoPackaging\DeterministicIoPackaging.csproj" />