fix: drop the obsolete OAuth-unavailable startup warning test

tests/test_transports_startup.py

@@ -144,12 +144,12 @@ def test_no_host_warning_on_loopback(
     assert capsys.readouterr().err == ""
 
 
-def test_oauth_enabled_with_a_bearer_warns_that_oauth_is_unavailable(
+def test_oauth_enabled_with_a_bearer_starts_without_warnings(
     uvicorn_spy: UvicornSpy, capsys: pytest.CaptureFixture[str]
 ) -> None:
     assert run_http(oauth_settings(mcp_bearer_token=BEARER_TOKEN)) == 0
 
-    assert "per-user OAuth is not available" in capsys.readouterr().err
+    assert capsys.readouterr().err == ""
 
 
 @pytest.mark.parametrize("value", ["*,10.0.0.1", "not-an-ip", "10.0.0.1/99"])