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Fixes
AttributeError: 'Values' object has no attribute 'tab_widtherror, reported internally and incorrectly fixed by #3076. docutils released a new version (0.17), which we were not pinning due to it being so infrequently being updated.sphinx-doc/sphinx#9049 (comment)
Visual inspection of the Streamlit API page shows that the docstrings and inline Streamlit apps are now deployed. While it appears that the Sphinx version itself may not be the cause of the error, leaving for future PR to address updating dependencies wholesale.
Edit: additionally sets
fail_on_warning: trueto try and fail faster when warnings are being thrown.