Add changelog

Author: xrmx

CHANGELOG.md

@@ -15,6 +15,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
   ([#4259](https://github.com/open-telemetry/opentelemetry-python/pull/4259))
 - sdk: setup EventLogger when OTEL_PYTHON_LOGGING_AUTO_INSTRUMENTATION_ENABLED is set
   ([#4270](https://github.com/open-telemetry/opentelemetry-python/pull/4270))
+- api: fix logging of duplicate EventLogger setup warning
+  ([#4299](https://github.com/open-telemetry/opentelemetry-python/pull/4299))
 
 ## Version 1.28.0/0.49b0 (2024-11-05)