Add changelog

Author: xrmx

CHANGELOG.md

@@ -20,7 +20,9 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Patch logging.basicConfig so OTel logs don't cause console logs to disappear
   ([#4436](https://github.com/open-telemetry/opentelemetry-python/pull/4436))
 - Fix ExplicitBucketHistogramAggregation to handle multiple explicit bucket boundaries advisories
- ([#4521](https://github.com/open-telemetry/opentelemetry-python/pull/4521))
+  ([#4521](https://github.com/open-telemetry/opentelemetry-python/pull/4521))
+- Fix serialization of extended attributes for logs signal
+  ([#4342](https://github.com/open-telemetry/opentelemetry-python/pull/4342))
 
 ## Version 1.31.0/0.52b0 (2025-03-12)