chore: update change log for Agent V3 N1C support. (#749)

* chore: update change log for Agent V3 N1C support.

* chore: updated the release date.

---------

Co-authored-by: Jon Torre <[email protected]>
Co-authored-by: Mike Jang <[email protected]>

Author: 3 people

content/nginx-one/changelog.md

@@ -30,6 +30,14 @@ h2 {
 
 Stay up-to-date with what's new and improved in the F5 NGINX One Console.
 
+## June 30, 2025
+
+### NGINX Agent version 3 support
+
+We have added support for NGINX Agent 3.x in NGINX One Console. You can now:
+
+- Manage data plane instances with NGINX Agent version 3.
+
 ## May 19, 2025
 
 ### Import and export your Staged Configs