Prepare release for opentelemetry-instrumentation-vertexai v2.2b0 (#4045)

Co-authored-by: otelbot <[email protected]>

Author: otelbot[bot]

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).
 
-## Unreleased
+## Version 2.2b0 (2025-12-19)
 - Fix overwritten log attributes in vertexai instrumentation
   ([#3925](https://github.com/open-telemetry/opentelemetry-python-contrib/pull/3925))
 - Add the `GEN_AI_OUTPUT_TYPE`, `GEN_AI_REQUEST_CHOICE_COUNT` and `GEN_AI_REQUEST_SEED` sem conv request attributes to events/spans generated in the stable instrumentation. This was added pre sem conv 1.36 so it should be in the stable instrumentation. See ([#4011](https://github.com/open-telemetry/opentelemetry-python-contrib/pull/4011)).

instrumentation-genai/opentelemetry-instrumentation-vertexai/src/opentelemetry/instrumentation/vertexai/version.py

@@ -12,4 +12,4 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-__version__ = "2.2b0.dev"
+__version__ = "2.2b0"