Flaky CI in task_python_docs.sh

[alexwong]

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When attempting to merge #88, noticed some flaky CI issues. The CI would hang when generating docs for tutorial from_caffe2.py. When running the test script locally in the CI container (v0.56 for neoai/ci-gpu), I saw that it would pass but also have some other errors occasionally which could mean a sphinx issue. It is likely that updating to v0.60 in the recent merge could solve the issues.