Change version numbers to 14.6.0

In anticipation of the GEOS-Chem (science codebase) 14.6.0 release,
we have updated the version numbers in

- CHANGELOG.md

Signed-off-by: Bob Yantosca <yantosca@seas.harvard.edu>

Author: yantosca

CHANGELOG.md

@@ -4,7 +4,7 @@ This file documents all notable changes to the GEOS-Chem repository starting in
 
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/), and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
-## [Unreleased] - TBD
+## [14.6.0] - 2025-04-18
 ### Added
 - Added CEDS 0.1 x 0.1 degree emissions (in `HEMCO/CEDS/v2024-06`)
 - Added met-field dependent dust tuning factors for GCHP C24 resolution in `setCommonRunSettings.sh`.  Others to be added later.