chore(deps): update dependency sphinx to v9

Author: renovate[bot]

pyproject.toml

@@ -39,7 +39,7 @@ dev = [
     "coveralls>=3.3.1",
     "responses>=0.23.2,<0.26.0",
     "sphinx-rtd-theme>=3.0.0,<3.1.0",
-    "sphinx>=6,<8",
+    "sphinx>=9,<10",
     "testcontainers>=4.13.0",
 ]
 stubs = [