Fix dependency version conflicts

Author: AArnott

Directory.Packages.props

@@ -31,7 +31,9 @@
     <PackageVersion Include="Microsoft.Win32.Registry" Version="5.0.0" />
     <PackageVersion Include="Microsoft.Windows.CsWin32" Version="0.2.188-beta" />
     <PackageVersion Include="Nullable" Version="1.3.1" />
+    <PackageVersion Include="System.Collections.Immutable" Version="6.0.0" />
     <PackageVersion Include="System.Drawing.Common" Version="7.0.0" />
+    <PackageVersion Include="System.Memory" Version="4.5.5" />
     <PackageVersion Include="System.Runtime.CompilerServices.Unsafe" Version="6.0.0" />
     <PackageVersion Include="System.Threading.Tasks.Dataflow" Version="7.0.0" />
     <PackageVersion Include="System.Threading.Tasks.Extensions" Version="4.5.4" />