refs and cleanup

Author: SimonCropp

src/Directory.Packages.props

@@ -10,13 +10,13 @@
     <PackageVersion Include="NodaTime" Version="3.2.1" />
     <PackageVersion Include="NUnit" Version="4.3.2" />
     <PackageVersion Include="NUnit3TestAdapter" Version="5.0.0" />
-    <PackageVersion Include="Polyfill" Version="7.22.0" />
+    <PackageVersion Include="Polyfill" Version="7.23.0" />
     <PackageVersion Include="ProjectDefaults" Version="1.0.149" />
     <PackageVersion Include="System.Collections.Immutable" Version="9.0.3" />
     <PackageVersion Include="System.IO.Compression" Version="4.3.0" />
-    <PackageVersion Include="Verify" Version="29.0.0-beta.1" />
+    <PackageVersion Include="Verify" Version="29.0.0-beta.6" />
     <PackageVersion Include="Verify.MailMessage" Version="1.1.0" />
-    <PackageVersion Include="Verify.NUnit" Version="29.0.0-beta.1" />
+    <PackageVersion Include="Verify.NUnit" Version="29.0.0-beta.6" />
     <!-- CVE -->
     <PackageVersion Include="System.IO.Packaging" Version="9.0.3" />
   </ItemGroup>