Release Notes:

  - Improved Rust syntax highlighting.

| Zed 0.174.6 | With this PR |
| --- | --- |
|
![Image](https://github.com/user-attachments/assets/0ec56dd0-2c17-4b5f-98e3-0897cb4e0192)
|
![Image](https://github.com/user-attachments/assets/309de467-dd32-47e9-ac40-96334a20d5c3)
|

- `identifier`: `variable`

```rust
let identifier = true;
const IDENTIFIER: i32 = 3;
```

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Co-authored-by: Marshall Bowers <git@maxdeviant.com>