[maestro] Add a subscription to 'Microsoft.DotNet.SharedFramework.Sdk'. (#21095)

This way the dependency is automatically bumped and we're not left in
the stone age.

Author: rolfbjarne

eng/Version.Details.xml

@@ -70,7 +70,11 @@
     </Dependency>
   </ProductDependencies>
   <ToolsetDependencies>
-    <Dependency Name="Microsoft.DotNet.Build.Tasks.Feed" Version="9.0.0-beta.24408.2">
+    <Dependency Name="Microsoft.DotNet.SharedFramework.Sdk" Version="8.0.0-beta.24413.2">
+      <Uri>https://github.com/dotnet/arcade</Uri>
+      <Sha>51321b7e150a2f426cb9e1334687bdfab68ec323</Sha>
+    </Dependency>
+    <Dependency Name="Microsoft.DotNet.Build.Tasks.Feed" Version="9.0.0-beta.24408.2" Pinned="true">
       <Uri>https://github.com/dotnet/arcade</Uri>
       <Sha>60ae233c3d77f11c5fdb53e570b64d503b13ba59</Sha>
     </Dependency>