Lower Python requirment to 3.9

noxfile.py

@@ -0,0 +1,14 @@
+from __future__ import annotations
+
+import nox
+
+nox.options.default_venv_backend = "uv"
+
+
+@nox.session(python=["3.9", "3.10", "3.11", "3.12", "3.13"])
+def tests(session: nox.Session) -> None:
+    """Run the test suite."""
+    # pip install .
+    session.install(".")
+    session.install("pytest", "pytest-httpx")
+    session.run("pytest")