feat(google-auth-oauthlib): Update Nox sessions to remove old versions

Author: chalmerlowe

packages/google-auth-oauthlib/noxfile.py

@@ -36,7 +36,6 @@
 DEFAULT_PYTHON_VERSION = "3.14"
 
 UNIT_TEST_PYTHON_VERSIONS: List[str] = [
-    "3.9",
     "3.10",
     "3.11",
     "3.12",