Fixup: pytest.skip must be pytest.mark.skipif for conditional skip

tests/backends/test_torch_native_compilation.py

@@ -164,7 +164,8 @@ def test_execute_torch():
     assert op_cpp is not None
 
 
-@pytest.skip('NO_GPU_EXECUTION' in os.environ, reason='Skip GPU execution tests')
+@pytest.mark.skipif('NO_GPU_EXECUTION' in os.environ, reason='Skip GPU execution tests')
+
 def test_execute_torch_gpu():
     x, y = pystencils.fields('x, y: float64[32,32]')