[Cherry-pick for 0.18] Update the download url in class EMNIST #8350

[NicolasHug]

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[pytorch-bot]

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🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/vision/8365

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❌ 2 New Failures

As of commit 1ea93cb with merge base 9cb639a ():

NEW FAILURES - The following jobs have failed:

• CMake / windows (windows.4xlarge, cpu) / windows-job (gh)
  The process 'C:\Program Files\Git\cmd\git.exe' failed with exit code 128
• Lint / python-types / linux-job (gh)
  RuntimeError: Command docker exec -t 6487a8a11a482a11d7b7f35ac27b49e18210dfe8a198f76f549c6dc85a256e88 /exec failed with exit code 1

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