Prepare for 9.0.0 Release (#383)

Signed-off-by: Addisu Z. Taddese <addisu@openrobotics.org>

Author: azeey

CMakeLists.txt

@@ -15,7 +15,7 @@ set(GZ_CMAKE_VER ${gz-cmake3_VERSION_MAJOR})
 #============================================================================
 # Configure the project
 #============================================================================
-gz_configure_project(VERSION_SUFFIX pre2)
+gz_configure_project(VERSION_SUFFIX)
 
 #============================================================================
 # Set project-specific options

Changelog.md

@@ -1,6 +1,6 @@
 ## Gazebo Fuel Tools 9.x
 
-### Gazebo Fuel Tools 9.0.0 (202X-XX-XX)
+### Gazebo Fuel Tools 9.0.0 (2023-09-29)
 
 1. Added script to update assets to gz
     * [Pull request #377](https://github.com/gazebosim/gz-fuel-tools/pull/377)