Added info about Umbraco 16

Author: bergmania

umbraco-cloud/release-notes/overview-2025/2025-06-releasenotes.md

@@ -3,6 +3,7 @@
 ## Key Takeaways
 * **Hostname Monitoring** – Get notified when your hostnames do not behave as expected, directly from the Cloud Portal.
 * **CI/CD v2 with target environment support** – You can now specify a development or flexible environment by name when deploying from pipelines.
+* **Umbraco 16** –  Umbraco 16 is now available on Umbraco Cloud.
 
 ## Hostname Monitoring
 Hostname Monitoring is now available on Umbraco Cloud, giving you better visibility and control over your environment setup.
@@ -16,3 +17,8 @@ Version 2 of the Umbraco Cloud CI/CD feature introduces support for specifying w
 Currently, target environments must be either the default development environment or a flexible environment. Deployment to the Live or Staging environments is not yet supported.
 
 Learn more in the [CI/CD on Umbraco Cloud](https://docs.umbraco.com/umbraco-cloud/set-up/project-settings/umbraco-cicd) article.
+
+## Umbraco 16
+You can now start new projects on Umbraco 16 or upgrade your existing projects to take advantage of the latest features and improvements.
+
+Umbraco 16 still runs on .NET 9 like Umbraco 15.