refs and cleanup

Author: SimonCropp

src/Directory.Packages.props

@@ -9,7 +9,7 @@
     <PackageVersion Include="NUnit" Version="4.4.0" />
     <PackageVersion Include="NUnit3TestAdapter" Version="5.2.0" />
     <PackageVersion Include="PdfPig" Version="0.1.12" />
-    <PackageVersion Include="Polyfill" Version="9.1.0" />
+    <PackageVersion Include="Polyfill" Version="9.2.0" />
     <PackageVersion Include="ProjectDefaults" Version="1.0.162" />
     <PackageVersion Include="Verify" Version="31.7.1" />
     <PackageVersion Include="Verify.DiffPlex" Version="3.1.2" />