Update CHANGELOG.md

Author: xrmx

CHANGELOG.md

@@ -26,9 +26,6 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
   ([#4427](https://github.com/open-telemetry/opentelemetry-python-contrib/pull/4427))
 - `opentelemetry-instrumentation-flask`: Clean up environ keys in `_teardown_request` to prevent duplicate execution
   ([#4341](https://github.com/open-telemetry/opentelemetry-python-contrib/pull/4341))
-
-### Fixed
-
 - `opentelemetry-instrumentation-flask`: Stop reading the deprecated (from 3.1) `flask.__version__` attribute; resolve the Flask version via `importlib.metadata`
   ([#4422](https://github.com/open-telemetry/opentelemetry-python-contrib/pull/4422))