Copy changelog updates from package-release/opentelemetry-util-genai/v0.1bx

Author: otelbot[bot]

util/opentelemetry-util-genai/CHANGELOG.md

@@ -7,7 +7,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## Unreleased
 
-## Version 0.1b0 (2025-09-24)
+## Version 0.1b0 (2025-09-25)
 
 - Add completion hook to genai utils to implement semconv v1.37.