9.1.0 requires a higher min python version

Author: mrm9084

pyproject.toml

@@ -74,7 +74,7 @@ dev = [
     "black >= 26.5.1, < 27.0.0",
     "pylint >= 4.0.7, < 5.0.0",
     "mypy >= 2.3.0, < 3.0.0",
-    "sphinx >= 9.1.0, < 10.0.0",
+    "sphinx >= 9.0.4, < 10.0.0",
     "sphinx_rtd_theme >= 3.1.0, < 4.0.0",
     "sphinx-toolbox >= 4.3.0, < 5.0.0",
     "myst_parser >= 5.1.0, < 6.0.0",