Add CHANGELOG entry for timelimit fix

Author: DrMeers

CHANGELOG.md

@@ -24,6 +24,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ### Fixed
 
+- `opentelemetry-instrumentation-celery`: Coerce timelimit values to strings in `set_attributes_from_context()` to prevent mixed-type span attribute warning
+  ([#4361](https://github.com/open-telemetry/opentelemetry-python-contrib/pull/4361))
 - `opentelemetry-docker-tests`: Replace deprecated `SpanAttributes` from `opentelemetry.semconv.trace` with `opentelemetry.semconv._incubating.attributes`
  ([#4339](https://github.com/open-telemetry/opentelemetry-python-contrib/pull/4339))
 - `opentelemetry-instrumentation-confluent-kafka`: Skip `recv` span creation when `poll()` returns no message or `consume()` returns an empty list, avoiding empty spans on idle polls