Ignore HPy test_HPyErr_WarnEx, issue GR-71943

Author: steve-s

graalpython/hpy/test/test_hpyerr.py

@@ -439,6 +439,7 @@ def check_warning(cls):
         check_warning(BytesWarning)
         check_warning(ResourceWarning)
 
+    @pytest.mark.skipif(IS_GRAALPY, reason="Bytecode DSL sources handling, GR-71943")
     def test_HPyErr_WarnEx(self):
         import warnings
         mod = self.make_module("""