Copy changelog updates from package-release/opentelemetry-instrumentation-google-genai/v0.2bx (#3453)

Author: opentelemetrybot

instrumentation-genai/opentelemetry-instrumentation-google-genai/CHANGELOG.md

@@ -7,7 +7,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## Unreleased
 
-## Version 0.2b0 (2025-04-25)
+## Version 0.2b0 (2025-04-28)
 
 - Add more request configuration options to the span attributes ([#3374](https://github.com/open-telemetry/opentelemetry-python-contrib/pull/3374))
 - Restructure tests to keep in line with repository conventions ([#3344](https://github.com/open-telemetry/opentelemetry-python-contrib/pull/3344))