Ignore overflow warning in TestConsistency::test_erfc (#2601)

The PR mutes numpy overflow warning in `TestConsistency::test_erfc`
raising due to type casting from float64 array to float32 dtype when no
fp64 support for allocating dpnp array.

Author: antonwolfy

dpnp/tests/test_special.py

@@ -65,6 +65,7 @@ def test_complex(self, func, dt):
 
 class TestConsistency:
 
+    @pytest.mark.filterwarnings("ignore::RuntimeWarning")
     def test_erfc(self):
         # TODO: replace with dpnp.random.RandomState, once pareto is added
         rng = numpy.random.RandomState(1234)