Fix test to pass locally.

Author: Gadgetoid

tests/test_setup.py

@@ -5,5 +5,5 @@
 def test_setup(gpiod):
     """Test init succeeds and GPIO pins are set up."""
     import blinkt
-    with pytest.raises(RuntimeError):
+    with pytest.raises((RuntimeError, SystemExit)):
         blinkt.show()