add changelog

Author: emdneto

CHANGELOG.md

@@ -14,6 +14,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 - Regenerate opentelemetry-proto code with v1.9.0 release
   ([#4840](https://github.com/open-telemetry/opentelemetry-python/pull/4840))
+- Add python 3.14 support
+  ([#4798](https://github.com/open-telemetry/opentelemetry-python/pull/4798))
 
 ## Version 1.39.0/0.60b0 (2025-12-03)