Update obsolete package to latest released version

Author: kzu

src/Attributed/Attributed.msbuildproj

@@ -1,14 +1,12 @@
-<Project Sdk="Microsoft.Build.NoTargets/3.5.0" TreatAsLocalProperty="Version">
+<Project Sdk="Microsoft.Build.NoTargets/3.5.0" TreatAsLocalProperty="Version">
   <PropertyGroup>
     <TargetFramework>net6.0</TargetFramework>
     <PackageId>Devlooped.Extensions.DependencyInjection.Attributed</PackageId>
     <Description>Superseded by Devlooped.Extensions.DependencyInjection</Description>
-    <Version>2.1.0-beta</Version>
+    <Version>2.1.0</Version>
   </PropertyGroup>
   <ItemGroup>
     <PackageReference Include="NuGetizer" Version="1.2.4" />
-  </ItemGroup>
-  <ItemGroup>
-    <ProjectReference Include="..\DependencyInjection\DependencyInjection.csproj" />
+    <PackageReference Include="Devlooped.Extensions.DependencyInjection" Version="2.1.0" />
   </ItemGroup>
 </Project>