Updates the URL of the character n-gram embeddings in vectors.py

[hassyGo]

The original URL of the character n-gram embeddings is no longer valid, so I have uplodaed exactly the same file to another place.

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/text/2214

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❌ 7 New Failures, 6 Unrelated Failures

As of commit 07c9538 with merge base c0d0685 ():

NEW FAILURES - The following jobs have failed:

• Bandit / build (gh)
• Build Windows Wheels / pytorch/text / wheel-py3_8-cpu (gh)
• Integration Test / tests (3.8) / linux-job (gh)
• Unit-tests on Linux CPU / tests (3.10) / linux-job (gh)
• Unit-tests on Linux CPU / tests (3.8) / linux-job (gh)
• Unit-tests on Linux CPU / tests (3.9) / linux-job (gh)
• Unit-tests on Linux GPU / tests (3.8, 11.7) / linux-job (gh)

FLAKY - The following jobs failed but were likely due to flakiness present on trunk:

• Build M1 Wheels / pytorch/text / wheel-py3_8-cpu (gh)
• Unit-tests on Macos CPU / tests (3.8) / macos-job (gh)
• Unit-tests on Windows CPU / tests (3.10) / windows-job (gh)
• Unit-tests on Windows CPU / tests (3.8) / windows-job (gh)
• Unit-tests on Windows CPU / tests (3.9) / windows-job (gh)

BROKEN TRUNK - The following job failed but were present on the merge base:

👉 Rebase onto the `viable/strict` branch to avoid these failures

• Unit-tests on Macos CPU / tests (3.9) / macos-job (gh)

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