Update opentelemetry-instrumentation-google-genai version to v0.4b0 (#3619)

Author: opentelemetrybot

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

@@ -7,6 +7,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## Unreleased
 
+## Version 0.3b0 (2025-07-08)
+
 - Add automatic instrumentation to tool call functions ([#3446](https://github.com/open-telemetry/opentelemetry-python-contrib/pull/3446))
 
 ## Version 0.2b0 (2025-04-28)

instrumentation-genai/opentelemetry-instrumentation-google-genai/src/opentelemetry/instrumentation/google_genai/version.py

@@ -17,4 +17,4 @@
 #   This version should stay below "1.0" until the fundamentals
 #   in "TODOS.md" have been addressed. Please revisit the TODOs
 #   listed there before bumping to a stable version.
-__version__ = "0.3b0.dev"
+__version__ = "0.4b0.dev"