Bump Microsoft.Extensions.DependencyInjection from 8.0.1 to 9.0.0 in /docs/core/extensions/snippets/di/di-basics in the dotnet group

Bump Microsoft.Extensions.DependencyInjection from 8.0.1 to 9.0.0 in /docs/core/extensions/snippets/di/di-basics in the dotnet group #3651