fix: remove the duplicate

Author: meaboutsoftware

Chapter-2-modules-separation/Src/Directory.Packages.props

@@ -9,7 +9,6 @@
     <PackageVersion Include="FluentValidation.DependencyInjectionExtensions" Version="12.0.0" />
     <PackageVersion Include="JetBrains.Annotations" Version="2025.2.2" />
     <PackageVersion Include="Microsoft.EntityFrameworkCore" Version="9.0.9" />
-    <PackageVersion Include="Microsoft.Extensions.DependencyInjection.Abstractions" Version="9.0.9" />
     <PackageVersion Include="Microsoft.AspNetCore.Http.Abstractions" Version="2.3.0" />
     <PackageVersion Include="Microsoft.AspNetCore.OpenApi" Version="9.0.9" />
     <PackageVersion Include="Microsoft.Extensions.Configuration" Version="9.0.9" />