Add changelog entry

Author: Sovietaced

CHANGELOG.md

@@ -42,6 +42,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
   ([#3917](https://github.com/open-telemetry/opentelemetry-python/pull/3917/))
 - Add OpenTelemetry trove classifiers to PyPI packages
   ([#3913] (https://github.com/open-telemetry/opentelemetry-python/pull/3913))
+- Update proto dependencies to allow protobuf 5
+  ([#3931](https://github.com/open-telemetry/opentelemetry-python/pull/3931))
 
 ## Version 1.24.0/0.45b0 (2024-03-28)