0.5.3: documentation build fails with sphinx 6.2.1

Looks like doc/content needs to be updated for sphinx +6.x

+ /usr/bin/sphinx-build -n -T -b man doc build/sphinx/man
Running Sphinx v6.2.1
python exec: /usr/bin/python3
sys.path: ['/usr/bin', '/usr/lib64/python38.zip', '/usr/lib64/python3.8', '/usr/lib64/python3.8/lib-dynload', '/home/tkloczko/.local/lib/python3.8/site-packages', '/usr/lib64/python3.8/site-packages', '/usr/lib/python3.8/site-packages']
numpy: 1.24.3, /usr/lib64/python3.8/site-packages/numpy/__init__.py
matplotlib: 3.6.3, /usr/lib64/python3.8/site-packages/matplotlib/__init__.py
ipython: 8.12.0, /usr/lib/python3.8/site-packages/IPython/__init__.py
making output directory... done

Traceback (most recent call last):
  File "/usr/lib/python3.8/site-packages/sphinx/cmd/build.py", line 280, in build_main
    app = Sphinx(args.sourcedir, args.confdir, args.outputdir,
  File "/usr/lib/python3.8/site-packages/sphinx/application.py", line 243, in __init__
    self.config.setup(self)
  File "/home/tkloczko/rpmbuild/BUILD/patsy-0.5.3/doc/conf.py", line 70, in setup
    app.add_javascript("show-code.js")
AttributeError: 'Sphinx' object has no attribute 'add_javascript'

Exception occurred:
  File "/home/tkloczko/rpmbuild/BUILD/patsy-0.5.3/doc/conf.py", line 70, in setup
    app.add_javascript("show-code.js")
AttributeError: 'Sphinx' object has no attribute 'add_javascript'
The full traceback has been saved in /tmp/sphinx-err-8x1irlvx.log, if you want to report the issue to the developers.
Please also report this if it was a user error, so that a better error message can be provided next time.
A bug report can be filed in the tracker at <https://github.com/sphinx-doc/sphinx/issues>. Thanks!

Start by running the documented sphinx-build command and inspect doc/conf.py, especially setup at line 70 where the Sphinx 6.2.1 build fails. Review the surrounding documentation configuration and doc content for the compatibility issue. Done means the documentation build completes successfully with Sphinx 6.2.1.