Update Rust crate zed_llm_client to v0.1.2 (#24329)

This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| [zed_llm_client](https://crates.io/crates/zed_llm_client) |
workspace.dependencies | patch | `0.1.1` -> `0.1.2` |

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Release Notes:

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