Document generation broken by latest sphinx 7.2.x

[Rotzbua]

sphinx 7.2.x removed a helper function which is used by extensions.

Solution

Stay with 7.1.x.

References

breathe-doc/breathe#943

https://github.com/svenevs/exhale/issues

Logoutput

 /opt/hostedtoolcache/Python/3.11.4/x64/lib/python3.11/site-packages/breathe/project.py:116: RemovedInSphinx80Warning: Sphinx 8 will drop support for representing paths as strings. Use "pathlib.Path" or "os.fspath" instead.
  self._default_build_dir = os.path.dirname(app.doctreedir.rstrip(os.sep))
making output directory... done
/opt/hostedtoolcache/Python/3.11.4/x64/lib/python3.11/site-packages/exhale/configs.py:1408: RemovedInSphinx80Warning: Sphinx 8 will drop support for representing paths as strings. Use "pathlib.Path" or "os.fspath" instead.
  _one     = containmentFolder == app.srcdir

Extension error (exhale):
Handler <function environment_ready at 0x7f7e45f46840> for event 'builder-inited' threw an exception (exception: startswith first arg must be str or a tuple of str, not _StrPath)
make: *** [Makefile:20: html] Error 2