Update release-toatu.yml: limit workflow dispatch branch

[jinzishuai]

to avoid problems like https://github.com/aitok-ai/LibreChatInternal/issues/115

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Summary

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Change Type

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• [ ] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
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• [ ] Documentation update

Testing

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Test Configuration:

Checklist

• [ ] My code adheres to this project's style guidelines
• [ ] I have performed a self-review of my own code
• [ ] I have commented in any complex areas of my code
• [ ] I have made pertinent documentation changes
• [ ] My changes do not introduce new warnings
• [ ] I have written tests demonstrating that my changes are effective or that my feature works
• [ ] Local unit tests pass with my changes
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