updated reference to new preview package

Author: Sophia Tevosyan

Directory.Packages.props

@@ -29,7 +29,7 @@
 
   <!-- DurableTask Packages -->
   <ItemGroup>
-    <PackageVersion Include="Microsoft.Azure.DurableTask.Core" Version="3.3.1-private1" />
+    <PackageVersion Include="Microsoft.Azure.DurableTask.Core" Version="3.3.1-private2" />
     <PackageVersion Include="Microsoft.Azure.Functions.Worker.Extensions.DurableTask" Version="1.2.2" />
   </ItemGroup>