LIBRISPEECH: fix .get_metadata type annotation

[kuraga]

No description provided.

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/audio/3757

• 📄 Preview Python docs built from this PR

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❌ 4 New Failures, 2 Unrelated Failures

As of commit 9891888 with merge base 87aeb55 ():

NEW FAILURES - The following jobs have failed:

• Build Windows Conda / pytorch/audio / upload / conda-py3_8-cpu (gh)
  Unable to find any artifacts for the associated workflow
• Build Windows Conda / pytorch/audio / upload / conda-py3_8-cuda11_8 (gh)
  Unable to find any artifacts for the associated workflow
• Build Windows Conda / pytorch/audio / upload / conda-py3_8-cuda12_1 (gh)
  Unable to find any artifacts for the associated workflow
• Unittests on Windows CPU / unittests-windows-cpu / windows-job (gh)
  The process 'C:\Program Files\Git\cmd\git.exe' failed with exit code 128

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

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

• Unit-tests on Linux GPU / tests (3.9, 11.8) / linux-job (gh)
  ##[error]The operation was canceled.
• Unittests on Windows GPU / unittests-windows-gpu / windows-job (gh)
  ImportError: DLL load failed while importing _C: The specified module could not be found.

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[kuraga]

Thanks!