Entry added to CHANGELOG.md linking to PR #4368

Author: davidgss04

CHANGELOG.md

@@ -36,6 +36,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
   ([#4302](https://github.com/open-telemetry/opentelemetry-python-contrib/pull/4302))
 - `opentelemetry-instrumentation-grpc`: Fix bidirectional streaming RPCs raising `AttributeError: 'generator' object has no attribute 'add_done_callback'`
   ([#4259](https://github.com/open-telemetry/opentelemetry-python-contrib/pull/4259))
+- `opentelemetry-instrumentation-fastapi`: Fix `FastAPI` instrumentation to correctly trace `BackgroundTasks` by wrapping their execution in a dedicated span, ensuring proper parent-child relationships and accurate trace timing
+  ([#4368](https://github.com/open-telemetry/opentelemetry-python-contrib/pull/4368))
 
 ### Breaking changes