chore(deps): update rust crate fsst-rs to v0.5.8 (#7031)

This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| [fsst-rs](https://redirect.github.com/spiraldb/fsst) |
workspace.dependencies | patch | `0.5.7` → `0.5.8` |

---

### Release Notes

<details>
<summary>spiraldb/fsst (fsst-rs)</summary>

###
[`v0.5.8`](https://redirect.github.com/spiraldb/fsst/blob/HEAD/CHANGELOG.md#058---2026-03-19)

[Compare
Source](https://redirect.github.com/spiraldb/fsst/compare/v0.5.7...v0.5.8)

##### Other

- Use maintained version of fxhash
([#&#8203;182](https://redirect.github.com/spiraldb/fsst/pull/182))

</details>

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