crf_decode: fix broken type annotation

[exyi]

Description

crf_decode returns a tuple of decode_tags, best_score, but the type annotation suggests that it returns only one tensor

Type of change

• [x] Bug fix

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[bot-of-gabrieldemarmiesse]

@howl-anderson

You are owner of some files modified in this pull request. Would you kindly review the changes whenever you have the time to? Thank you very much.

[bhack]

@exyi You need to sign the CLA

[exyi]

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