Register Slimsy (and other dependencies) using a Composer

RegisterDependencies.cs

using Slimsy.DependencyInjection;
using Umbraco.Cms.Core.Composing;

namespace MyProject;

public class RegisterDependencies : IComposer
{
    public void Compose(IUmbracoBuilder builder)
    {
        builder.AddSlimsy();
    }
}