Update changelog release date

Author: aabmass

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

@@ -5,7 +5,7 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
-## 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))