Update mnist.py

[claudemircasa]

Fixed error when downloading dataset

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/vision/8398

• 📄 Preview Python docs built from this PR

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❌ 3 New Failures

As of commit 33b4383 with merge base 89d2b38 ():

NEW FAILURES - The following jobs have failed:

• Build Linux Conda / pytorch/vision / upload / conda-py3_8-cuda12_1 (gh)
  Unable to find an artifact with the name: pytorch_vision__3.8_cu121_
• Build Windows Conda / pytorch/vision / upload / conda-py3_8-cpu (gh)
  Unable to find an artifact with the name: pytorch_vision__3.8_cpu_
• Lint / python-types / linux-job (gh)
  RuntimeError: Command docker exec -t 307ee8bd36dddcf9d2434b808f17f7e08d1047ae5ad331a3ba8090f791aca8b2 /exec failed with exit code 1

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[NicolasHug]

Thanks for the PR @claudemircasa . It looks like the 2 existing mirrors are up and running - what was the download issue you were experiencing?