Update expected values in `MgpstrModelIntegrationTest`
# What does this PR do?

[CI](https://github.com/huggingface/transformers/actions/runs/4422120632/jobs/7753698495) failed: the expected values provided by the contributor didn't match the one given in CI runner, and we just need to update it.
_The documentation is not available anymore as the PR was closed or merged._