remove netstandard2

Author: rysweet

dotnet/Directory.Build.props

@@ -3,7 +3,7 @@
   <Import Project="./eng/MetaInfo.props" />
   <Import Project="./eng/Sign.props" />
   <PropertyGroup>
-    <PackageTargetFrameworks>netstandard2.0;net8.0</PackageTargetFrameworks>
+    <PackageTargetFrameworks>net8.0</PackageTargetFrameworks>
     <TestTargetFrameworks>net8.0</TestTargetFrameworks>
     <LangVersion>preview</LangVersion>
 	  <Nullable>enable</Nullable>

dotnet/src/AutoGen.DotnetInteractive/AutoGen.DotnetInteractive.csproj

@@ -28,7 +28,7 @@
 	  <EmbeddedResource Include="RestoreInteractive.config" />
 	</ItemGroup>
 
-  <ItemGroup Condition="'$(TargetFramework)' == 'net9.0'">
+  <ItemGroup>
     <PackageReference Include="Microsoft.DotNet.Interactive.Jupyter" />
     <PackageReference Include="Microsoft.DotNet.Interactive.PackageManagement" />
   </ItemGroup>