Fix GCS bucket in uq_benchmark_2019/README.md.
Fix GCS bucket in uq_benchmark_2019/README.md.

PiperOrigin-RevId: 257172056

google-research/google-research,google-research/google-research,google-research/google-research,google-research/google-research,google-research/google-research,google-research/google-research,google-research/google-research,google-research/google-research,google-research/google-research,google-research/google-research,google-research/google-research