Adjust opentelemetry-instrumentation-vertexai dependency on opentelemetry-genai-util

This fixes the CI failure on the release PRs for opentelemetry-util-genai

- open-telemetry#3784 (needs cherry pick)
- open-telemetry#3783

Author: aabmass

instrumentation-genai/opentelemetry-instrumentation-vertexai/pyproject.toml

@@ -26,7 +26,9 @@ classifiers = [
 dependencies = [
   "opentelemetry-api ~= 1.28",
   "opentelemetry-instrumentation ~= 0.58b0",
-  "opentelemetry-util-genai == 0.1b0.dev",
+  # TODO https://github.com/open-telemetry/opentelemetry-python-contrib/issues/3786: restrict
+  # version after the first release
+  "opentelemetry-util-genai",
   "opentelemetry-semantic-conventions ~= 0.58b0",
 ]