Update developer documentation dependencies #4485
Merged
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Any background context you want to provide?
We were pretty far behind versions in Sphinx. Another PR was failing due to an incompatibility with an older version. Message was
The sphinxcontrib.applehelp extension used by this project needs at least Sphinx v5.0; it therefore cannot be built with this version.
and seen hereWhat's this PR do?
How should this be manually tested?
pip install...
,tox -e docs
What are the relevant tickets?
n/a
Screenshots (if appropriate)