ci: fix failing readthedocs build by adding sphinx_rtd_theme dependency

neovim / pynvim

Python client and plugin host for Nvim

http://pynvim.readthedocs.io/en/latest/

Apache License 2.0

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Closed wookayin closed 9 months ago

wookayin commented 9 months ago

This might fix the failing readthedocs CI #552 issue (can't fully test until merged).