Mute expected float32 overflow warning in batch cumprod test

On non-fp64 devices test_cumprod_axis_batch_kernels runs in float32,
where the cumulative product overflows to inf along long axes (dpnp and
the NumPy reference alike, so the inf==inf comparison still holds). Add
a message-scoped filterwarnings mark so the expected NumPy overflow
RuntimeWarning is no longer reported by the infra-warnings tracker.

Author: antonwolfy

dpnp/tests/third_party/cupy/math_tests/test_sumprod.py

@@ -967,6 +967,7 @@ def test_cumprod_numpy_array(self, dtype):
             return cupy.cumprod(a_numpy)
 
     @pytest.mark.parametrize("shape, axis", _BATCH_SCAN_AXIS_CASES)
+    @pytest.mark.filterwarnings("ignore:overflow encountered:RuntimeWarning")
     @testing.numpy_cupy_allclose(
         rtol=1e-5,
         atol=1e-6,