Seal/abstract/virtual everything (#6739)

Content.Benchmarks/DependencyInjectBenchmark.cs

@@ -6,7 +6,7 @@ namespace Content.Benchmarks
 {
     // To actually run this benchmark you'll have to make DependencyCollection public so it's accessible.
 
-    public class DependencyInjectBenchmark
+    public sealed class DependencyInjectBenchmark
     {
         [Params(InjectMode.Reflection, InjectMode.DynamicMethod)]
         public InjectMode Mode { get; set; }