[opentelemetry-instrumentation-google-genai] Update opentelemetry-util-genai depenecy after release

[wikaaaaa]

After release of #4181 version of opentelemetry-util-genai dependency needs to be updated.

Changes required in:

• instrumentation-genai/opentelemetry-instrumentation-google-genai/tests/requirements.oldest.txt

• instrumentation-genai/opentelemetry-instrumentation-google-genai/pyproject.toml