Update changelog

Author: SrdjanLL

CHANGELOG.md

@@ -30,6 +30,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
   ([#3447](https://github.com/open-telemetry/opentelemetry-python-contrib/pull/3447))
 - `opentelemetry-instrumentation-botocore` Capture server attributes for botocore API calls
   ([#3448](https://github.com/open-telemetry/opentelemetry-python-contrib/pull/3448))
+- `opentelemetry-instrumentation-botocore` Use semantic convention attribute for cloud region for botocore API calls
+  ([#3474](https://github.com/open-telemetry/opentelemetry-python-contrib/pull/3474))
 
 ## Version 1.32.0/0.53b0 (2025-04-10)