docs: update changelog for go v1.25.8 security fixes (#362)

## Changes
- Added `### security` section to `## Unreleased` in CHANGELOG.md
- go v1.25.8 upgrade fixes security vulnerabilities and should be
categorized as a security fix

Author: shashank-reddy-nr

CHANGELOG.md

@@ -7,6 +7,10 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 
 ## Unreleased
 
+### security
+- update go to v1.25.8
+- update org.apache.kafka:kafka-clients to v3.9.2
+
 ## v3.16.2 - 2026-02-11
 
 ### ⛓️ Dependencies