Add changelog for 2025-03-14

Author: quantstruct-bot

fern/changelog/2025-03-14.mdx

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+## Blocks Schema Deprecations, Scheduling Enhancements, and New Voice Options for Vapi Voice
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+2. **'scheduled' Status Added to Calls and Messages**: You can now set the status of a call or message to `scheduled`, allowing it to be executed at a future time. This enables scheduling functionality within your application for calls and messages.
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+3. **New Voice Options for Text-to-Speech**: Four new voices—`Neha`, `Cole`, `Harry`, and `Paige`—have been added for text-to-speech services. You can enhance user experience by setting the `voiceId` to one of these options in your configurations.
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+3. **Removal of Step and Block Schemas**:
+<Warning>Blocks and Steps are now officially deprecated. Developers should update their applications to adapt to these changes, possibly by using new or alternative schemas provided.</Warning>