Fix segfault issue

I'd been using dlpack for copying triton tensors to torch tensors,
which I did because it was advertised to perform zero copy transfers.
Turns out that only worked on my laptop, and didn't work on other machines.
IDK why. But for now, I'm just copying the tensors as triton<->numpy<->torch.
That works on the VM on which earlier code was segfaulting

Signed-off-by: Parth <thakkarparth007@gmail.com>

tests/python_backend/test_setup.py

@@ -161,4 +161,3 @@ def test_python_backend(n_gpus: int):
         # killing docker-compose process doesn't bring down the containers.
         # explicitly stop the containers:
         subprocess.run(["docker-compose", "-f", compose_file, "down"], cwd=curdir, check=True, env=load_test_env())
-