Fix SSML Implementation by Adding <voice> Tag

[samirsalman]

This pull request fixes the SSML implementation in the Azure Text-to-Speech (TTS) integration by correctly adding the tag. This ensures that the SSML is properly structured and the specified voice is used during synthesis.

Hope to get soon a document with info about contribution and code test guidelines 🙏

[changeset-bot[bot]]

🦋 Changeset detected

Latest commit: 63ed857dd7be4faa06f426d77a944f44bb9caf8b

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
livekit-plugins-azure	Patch

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[theomonnom]

Hey, can. you run ruff format and ruff check --fix

[samirsalman]

@theomonnom ✅ done