[VoiceLive]Change release date for version 1.1.0

[xitzhang]

Updated release date for version 1.1.0.

Description

Please add an informative description that covers that changes made by the pull request and link all relevant issues.

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• The pull request does not introduce [breaking changes]
• CHANGELOG is updated for new features, bug fixes or other significant changes.
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Pull request overview

Updates the azure-ai-voicelive package changelog to adjust the recorded release date for version 1.1.0.

Changes:

• Updated the 1.1.0 CHANGELOG header date from 2026-07-20 to 2026-07-28.