tests fail against sphinx 7.3.x

[dirkmueller]

I'm getting this test failure with Sphinx 7.3.x:

 =================================== FAILURES ===================================
 ____________ make_app_.unused_kwargs_become_releases_config_options ____________

 self = <util.make_app_ object at 0x7f0cf898a680>

     def unused_kwargs_become_releases_config_options(self):
         app = make_app(debug=True, document_name="notchangelog")
         assert app.config.releases_debug is True
 >       assert app.config.releases_document_name == "notchangelog"
 E       AssertionError