Update changelog with changes from v0.19.6

Author: NewRelic-K8s-Agents-Bot

CHANGELOG.md

@@ -7,6 +7,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## Unreleased
 
+## v0.19.6 - 2026-01-12
+
 ### dependency
 - Updated helm to v3.19.4 for chart linting @jamescripter [#457](https://github.com/newrelic/newrelic-k8s-metrics-adapter/pull/457)