update CHANGELOG.md

Author: divine7022

CHANGELOG.md

@@ -33,6 +33,7 @@ For more information about this file see also [Keep a Changelog](http://keepacha
 - PEcAn.SIPNET now accepts relative paths in its input XML (#3418). Previously all files referenced in the autogenerated `job.sh` needed to be specified as absolute paths.
 - R version 4.4 installs Python 3.12 which wants to leverage os managed packages instead, install python3-pika using apt.
 - Fixed a bugs and BADM now process both single-site and multi-site settings, detecting the input structure and processing each site independently to generate the correct number of ensemble members per site.
+- Fixed "external pointer is not valid" error and addressed key bugs in `soilgrids_soilC_extract()` function (#3506)
 
 ### Changed