fix: changelog

Author: pichlermarc

experimental/CHANGELOG.md

@@ -16,6 +16,7 @@ All notable changes to experimental packages in this project will be documented
 ### :bug: (Bug Fix)
 
 * fix(sdk-node): allow using samplers when the exporter is defined in the environment [#4394](https://github.com/open-telemetry/opentelemetry-js/pull/4394) @JacksonWeber
+* fix(otlp-transformer): only use BigInt inside hrTimeToNanos() [#4484](https://github.com/open-telemetry/opentelemetry-js/pull/4484) @pichlermarc
 
 ### :books: (Refine Doc)