Update to a stable Aspire version (#146)

This was causing issues on CI as it is restoring a stable workload while
we were still on a preview release

Author: Mpdreamz

examples/AppHost/AppHost.csproj

@@ -9,7 +9,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="Aspire.Hosting" Version="8.0.0-preview.4.24156.9" />
+    <PackageReference Include="Aspire.Hosting.AppHost" Version="8.2.0" />
   </ItemGroup>
 
   <ItemGroup>