bump sphinx attempt fix readthedocs build

requirements-doc.txt

@@ -8,7 +8,7 @@ astroid>=2.11.0,<3
 jinja2<3.1 # Avoid jinja2 3.1 version, which breaks with sphinx 3.X (https://github.com/sphinx-doc/sphinx/issues/10291)
 sphinx-autoapi>=2.1.0
 sphinx-paramlinks>=0.4.1
-sphinx==7.1
+sphinx>=7.1,<8
 sphinxcontrib-redoc>=1.6.0
 sphinx_autodoc_typehints[type-comment]>=1.19.3,<1.23.1
 sphinx_rtd_theme