fix(deps): update rust crate fastembed to v4 (#250)

This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| [fastembed](https://crates.io/crates/fastembed)
([source](https://togithub.com/Anush008/fastembed-rs)) | dependencies |
major | `3.6` -> `4.0` |

---

### Release Notes

<details>
<summary>Anush008/fastembed-rs (fastembed)</summary>

###
[`v4.0.0`](https://togithub.com/Anush008/fastembed-rs/releases/tag/v4.0.0)

[Compare
Source](https://togithub.com/Anush008/fastembed-rs/compare/v3.14.1...v4.0.0)

##### 🍕 Features

- Configurable Mean pooling
([#&#8203;99](https://togithub.com/Anush008/fastembed-rs/issues/99))
([4f09b68](https://togithub.com/Anush008/fastembed-rs/commit/4f09b6842ce1fcfaf6362678afcad9a176e05304))
- By [@&#8203;triandco](https://togithub.com/triandco)

- Image Embeddings
([#&#8203;101](https://togithub.com/Anush008/fastembed-rs/issues/101))
([94b8f78](https://togithub.com/Anush008/fastembed-rs/commit/94b8f78497e3577abeddfc8f82c0c7b44556cc3b))
- By [@&#8203;lywa1998](https://togithub.com/lywa1998)

- `EmbeddingOutput` to allow for custom output key and transformations
([#&#8203;102](https://togithub.com/Anush008/fastembed-rs/issues/102))
([befdb32](https://togithub.com/Anush008/fastembed-rs/commit/befdb3263860e4ac3bbb87ccb55402c372aca3ef))
- By [@&#8203;denwong47](https://togithub.com/denwong47)

</details>

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