Make internal & private classes sealed where possible, to avoid code for virtual dispatch (#19719)

src/Umbraco.PublishedCache.HybridCache/Serialization/JsonContentNestedDataSerializerFactory.cs

@@ -1,6 +1,6 @@
 namespace Umbraco.Cms.Infrastructure.HybridCache.Serialization;
 
-internal class JsonContentNestedDataSerializerFactory : IContentCacheDataSerializerFactory
+internal sealed class JsonContentNestedDataSerializerFactory : IContentCacheDataSerializerFactory
 {
     private readonly Lazy<JsonContentNestedDataSerializer> _serializer = new();