[codemod] c10::optional -> std::optional in pyspeech/experimental/csrc/decoders/TransducerDecoder.h +20

[r-barnes]

Summary: c10::optional was switched to be std::optional after PyTorch moved to C++17. Let's eliminate c10::optional, if we can.

Reviewed By: albanD

Differential Revision: D57294284

[pytorch-bot[bot]]

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:x: 2 New Failures

As of commit 9e9ac54f1c318b790f050039bd4764d7cc0bfab3 with merge base ea437b31ce316ea3d66fe73768c0dcb94edb79ad ():

NEW FAILURES - The following jobs have failed:

* [Build Linux Conda / pytorch/audio / upload / conda-py3_8-cuda12_4](https://hud.pytorch.org/pr/pytorch/audio/3793#24957359276) ([gh](https://github.com/pytorch/audio/actions/runs/9081474520/job/24957359276)) `Unable to find an artifact with the name: pytorch_audio__3.8_cu124_` * [Unit-tests on Linux GPU / tests (3.9, 11.8) / linux-job](https://hud.pytorch.org/pr/pytorch/audio/3793#24955443644) ([gh](https://github.com/pytorch/audio/actions/runs/9081474503/job/24955443644)) `##[error]The operation was canceled.`

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This pull request was exported from Phabricator. Differential Revision: D57294284