Log Message:
py-sphinx: updated to 3.5.4

Release 3.5.4 (released Apr 11, 2021)
=====================================

Dependencies
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* Restrict docutils to 0.16

Bugs fixed
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* autodoc: Async staticmethods and classmethods are considered as non
  async coroutine-functions with Python3.10
* html theme: The style are not applied with docutils-0.17
  - toctree captions
  - The content of ``sidebar`` directive
  - figures