Fix download link for raft_small

[NicolasHug]

Accidentally messed up the link in #5076 - tests pass now

(raft) ➜  vision git:(main) ✗ PYTORCH_TEST_WITH_PROTOTYPE=1 pytest test/test_prototype_models.py -k raft
============================================================================== test session starts ===============================================================================
platform linux -- Python 3.9.6, pytest-6.2.5, py-1.10.0, pluggy-0.13.1
rootdir: /fsx/users/nicolashug/work/vision, configfile: pytest.ini
plugins: mock-3.6.1
collected 555 items / 543 deselected / 12 selected

test/test_prototype_models.py ............                                                                                                                                 [100%]

================================================================================ warnings summary ================================================================================
test/test_prototype_models.py::test_old_vs_new_factory[cpu-raft_large]
test/test_prototype_models.py::test_old_vs_new_factory[cpu-raft_small]
test/test_prototype_models.py::test_old_vs_new_factory[cuda-raft_large]
test/test_prototype_models.py::test_old_vs_new_factory[cuda-raft_small]
  /fsx/users/nicolashug/work/vision/torchvision/prototype/models/_utils.py:71: UserWarning: The parameter 'pretrained' is deprecated, please use 'weights' instead.
    warnings.warn(

test/test_prototype_models.py::test_old_vs_new_factory[cpu-raft_large]
test/test_prototype_models.py::test_old_vs_new_factory[cuda-raft_large]
  /fsx/users/nicolashug/work/vision/torchvision/prototype/models/_utils.py:84: UserWarning: Arguments other than a weight enum or `None` for 'weights' are deprecated. The current behavior is equivalent to passing `weights=Raft_Large_Weights.C_T_V2`. You can also use `weights=Raft_Large_Weights.default` to get the most up-to-date weights.
    warnings.warn(msg)

test/test_prototype_models.py::test_old_vs_new_factory[cpu-raft_small]
test/test_prototype_models.py::test_old_vs_new_factory[cuda-raft_small]
  /fsx/users/nicolashug/work/vision/torchvision/prototype/models/_utils.py:84: UserWarning: Arguments other than a weight enum or `None` for 'weights' are deprecated. The current behavior is equivalent to passing `weights=Raft_Small_Weights.C_T_V2`. You can also use `weights=Raft_Small_Weights.default` to get the most up-to-date weights.
    warnings.warn(msg)

-- Docs: https://docs.pytest.org/en/stable/warnings.html
================================================================= 12 passed, 543 deselected, 8 warnings in 8.12s =================================================================

cc @datumbox

[facebook-github-bot]

💊 CI failures summary and remediations

As of commit bfba31f (more details on the Dr. CI page):

---

• 1/2 failures introduced in this PR
• 1/2 broken upstream at merge base 2508a02 since Dec 09

---

1 failure not recognized by patterns:

Job	Step	Action
binary_linux_conda_py3.6_cu111	packaging/build_conda.sh	🔁 rerun

---

1 job timed out:

• binary_linux_conda_py3.6_cu111

---

🚧 1 ongoing upstream failure:

These were probably caused by upstream breakages that are not fixed yet.

• cmake_windows_gpu since Dec 09 (2508a02)
  • 🔁 rerun

---

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[datumbox]

LGTM!

[github-actions]

Hey @NicolasHug!

You merged this PR, but no labels were added. The list of valid labels is available at https://github.com/pytorch/vision/blob/main/.github/process_commit.py