add changelog for 3751

Author: jenshnielsen

CHANGELOG.md

@@ -7,6 +7,9 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## Unreleased
 
+- Fix python 3.12 deprecation warning
+  ([#3751](https://github.com/open-telemetry/opentelemetry-python/pull/3751))
+
 ## Version 1.23.0/0.44b0 (2024-02-23)
 
 - Use Attribute rather than boundattribute in logrecord