test(cuda.core): fix options regex for AdviseOptions ("an" vs "a")

The advise() error message reads "must be an AdviseOptions instance or
None" (vowel triggers "an"), but the regex matched only "must be a ".
Relax to "must be an?" so all three op tests pass.

Author: rparolin

cuda_core/tests/memory/test_managed_ops.py

@@ -517,7 +517,7 @@ def test_options_must_be_none(self, init_cuda):
         mr = create_managed_memory_resource_or_skip()
         buf = mr.allocate(_MANAGED_TEST_ALLOCATION_SIZE)
         stream = device.create_stream()
-        with pytest.raises(TypeError, match="must be a .*Options instance or None"):
+        with pytest.raises(TypeError, match="must be an? .*Options instance or None"):
             prefetch(buf, Location.host(), options={}, stream=stream)
         buf.close()
 
@@ -578,7 +578,7 @@ def test_options_must_be_none(self, init_cuda):
         mr = create_managed_memory_resource_or_skip()
         buf = mr.allocate(_MANAGED_TEST_ALLOCATION_SIZE)
         stream = device.create_stream()
-        with pytest.raises(TypeError, match="must be a .*Options instance or None"):
+        with pytest.raises(TypeError, match="must be an? .*Options instance or None"):
             discard(buf, options={}, stream=stream)
         buf.close()
 
@@ -706,6 +706,6 @@ def test_options_must_be_none(self, init_cuda):
         _skip_if_managed_allocation_unsupported(device)
         device.set_current()
         buf = DummyUnifiedMemoryResource(device).allocate(_MANAGED_TEST_ALLOCATION_SIZE)
-        with pytest.raises(TypeError, match="must be a .*Options instance or None"):
+        with pytest.raises(TypeError, match="must be an? .*Options instance or None"):
             advise(buf, "set_read_mostly", options={})
         buf.close()