python-sphinx-autoapi fails to build with sphinx 8.x in Fedora 42 (currently Rawhide).

The issue detected:
```
=================================== FAILURES ===================================
____________________ test_nothing_to_render_raises_warning _____________________

builder = <function builder.<locals>.build at 0x7f973155d580>

    def test_nothing_to_render_raises_warning(builder):
>       with pytest.raises(sphinx.errors.SphinxWarning) as exc_info:
E       Failed: DID NOT RAISE <class 'sphinx.errors.SphinxWarning'>

/builddir/build/BUILD/python-sphinx-autoapi-3.2.1-build/sphinx_autoapi-3.2.1/tests/python/test_pyintegration.py:1206: Failed
----------------------------- Captured stdout call -----------------------------
Running Sphinx v8.1.3
loading translations [en]... done
making output directory... done
Converting `source_suffix = '.rst'` to `source_suffix = {'.rst': 'restructuredtext'}`.
[AutoAPI] Reading files... [100%] /builddir/build/BUILD/python-sphinx-autoapi-3.2.1-build/sphinx_autoapi-3.2.1/tests/python/pynorender/example/_example.py

[AutoAPI] Mapping Data... [100%] /builddir/build/BUILD/python-sphinx-autoapi-3.2.1-build/sphinx_autoapi-3.2.1/tests/python/pynorender/example/_example.py

[AutoAPI] Rendering Data... 
[autosummary] generating autosummary for: index.rst
building [mo]: targets for 0 po files that are out of date
writing output... 
building [html]: targets for 1 source files that are out of date
updating environment: [new config] 1 added, 0 changed, 0 removed
reading sources... [100%] index
[AutoAPI] Adding AutoAPI TOCTree [autoapi/index] to index.rst

looking for now-outdated files... none found
pickling environment... done
checking consistency... done
preparing documents... done
copying assets... 
copying static files... 
Writing evaluated template result to /builddir/build/BUILD/python-sphinx-autoapi-3.2.1-build/sphinx_autoapi-3.2.1/tests/python/pynorender/_build/html/_static/basic.css
Writing evaluated template result to /builddir/build/BUILD/python-sphinx-autoapi-3.2.1-build/sphinx_autoapi-3.2.1/tests/python/pynorender/_build/html/_static/documentation_options.js
Writing evaluated template result to /builddir/build/BUILD/python-sphinx-autoapi-3.2.1-build/sphinx_autoapi-3.2.1/tests/python/pynorender/_build/html/_static/language_data.js
Writing evaluated template result to /builddir/build/BUILD/python-sphinx-autoapi-3.2.1-build/sphinx_autoapi-3.2.1/tests/python/pynorender/_build/html/_static/alabaster.css
copying static files: done
copying extra files... 
copying extra files: done
copying assets: done
writing output... [100%] index

generating indices... genindex done
writing additional pages... search done
dumping search index in English (code: en)... done
dumping object inventory... done
build finished with problems, 6 warnings (with warnings treated as errors).
----------------------------- Captured stderr call -----------------------------
WARNING: No modules were rendered. Do you need to set autoapi_options to render additional objects? [autoapi.nothing_rendered]
/builddir/build/BUILD/python-sphinx-autoapi-3.2.1-build/sphinx_autoapi-3.2.1/tests/python/pynorender/index.rst:9: WARNING: toctree contains reference to nonexisting document 'autoapi/index' [toc.not_readable]
/builddir/build/BUILD/python-sphinx-autoapi-3.2.1-build/sphinx_autoapi-3.2.1/tests/python/pynorender/index.rst:15: WARNING: toctree contains reference to nonexisting document 'autoapi/index'
/builddir/build/BUILD/python-sphinx-autoapi-3.2.1-build/sphinx_autoapi-3.2.1/tests/python/pynorender/index.rst:15: WARNING: toctree contains reference to nonexisting document 'autoapi/index'
/builddir/build/BUILD/python-sphinx-autoapi-3.2.1-build/sphinx_autoapi-3.2.1/tests/python/pynorender/index.rst:15: WARNING: toctree contains reference to nonexisting document 'autoapi/index'
/builddir/build/BUILD/python-sphinx-autoapi-3.2.1-build/sphinx_autoapi-3.2.1/tests/python/pynorender/index.rst:15: WARNING: toctree contains reference to nonexisting document 'autoapi/index'
=========================== short test summary info ============================
FAILED tests/python/test_pyintegration.py::test_nothing_to_render_raises_warning
================= 1 failed, 310 passed, 2 deselected in 20.16s =================
```

This issue is fixed in the latest version of python-sphinx-autoapi. Please, backport the patch or update the package. I plan to ship sphinx 8 in two weeks.

https://github.com/readthedocs/sphinx-autoapi/commit/23eca06f8d66763ea82ad704d370e840cb961cfe


For the logs from testing build attempts, see:
https://copr.fedorainfracloud.org/coprs/thrnciar/python-sphinx/package/python-sphinx-autoapi/

You can test you package in mock running:

$ mock -r fedora-rawhide-x86_64
--addrepo=https://download.copr.fedorainfracloud.org/results/thrnciar/python-sphinx/fedora-rawhide-x86_64/ --no-clean your.src.rpm
$ mock -r fedora-rawhide-x86_64
--addrepo=https://download.copr.fedorainfracloud.org/results/thrnciar/python-sphinx/fedora-rawhide-x86_64/ shell

We'd like to include Sphinx 8 in Fedora 42.
Let us know here if you have any questions. Thank you!