Librispeech RNNT recipe updates for pytorch lightening 2.0

[huangruizhe]

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[pytorch-bot]

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@huangruizhe has imported this pull request. If you are a Meta employee, you can view this diff on Phabricator.

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@huangruizhe merged this pull request in e6c8973.

[github-actions]

Hey @huangruizhe.
You merged this PR, but labels were not properly added. Please add a primary and secondary label (See https://github.com/pytorch/audio/blob/main/.github/process_commit.py).

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