Fix duplex_stt.yaml format

[Edresson]

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[Edresson]

/ok to test 40e382e

[Edresson]

/ok to test 19c2941

[github-actions]

[🤖]: Hi @Edresson 👋,

We wanted to let you know that a CICD pipeline for this PR just finished successfully.

So it might be time to merge this PR or get some approvals.