Updated changelog and package version for Netcode in anticipation of v2.9.0 release

Author: svc-netcode-sdk

com.unity.netcode.gameobjects/CHANGELOG.md

@@ -6,7 +6,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/)
 
 Additional documentation and release notes are available at [Multiplayer Documentation](https://docs-multiplayer.unity3d.com).
 
-## [Unreleased]
+## [2.9.0] - 2026-02-01
 
 ### Added
 
@@ -20,12 +20,6 @@ Additional documentation and release notes are available at [Multiplayer Documen
 - Improve performance of `NetworkObject`. (#3820, #3831)
 - If the Unity Transport Disconnect Timeout is set to 0 in the Editor, the timeout will be entirely disabled. (#3810)
 
-### Deprecated
-
-
-### Removed
-
-
 ### Fixed
 
 - Duplicate transport connection events for the same connection will now do nothing. (#3863)
@@ -34,12 +28,6 @@ Additional documentation and release notes are available at [Multiplayer Documen
 - Fixed an integer overflow that occurred when configuring a large disconnect timeout with Unity Transport. (#3810)
 
 
-### Security
-
-
-### Obsolete
-
-
 ## [2.8.0] - 2025-12-15
 
 ### Added