Copy changelog updates from package-release/opentelemetry-instrumentation-vertexai/v2.0bx (#3295)

Co-authored-by: Riccardo Magliocchetti <[email protected]>

Author: opentelemetrybot

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

@@ -7,7 +7,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## Unreleased
 
-## Version 2.0b0 (2025-02-21)
+## Version 2.0b0 (2025-02-24)
 
 - Added Vertex AI spans for request parameters
   ([#3192](https://github.com/open-telemetry/opentelemetry-python-contrib/pull/3192))