Update Rust crate smallvec to v1.15.0 (#28469)

This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| [smallvec](https://redirect.github.com/servo/rust-smallvec) |
workspace.dependencies | minor | `1.14.0` -> `1.15.0` |

---

### Release Notes

<details>
<summary>servo/rust-smallvec (smallvec)</summary>

###
[`v1.15.0`](https://redirect.github.com/servo/rust-smallvec/releases/tag/v1.15.0)

[Compare
Source](https://redirect.github.com/servo/rust-smallvec/compare/v1.14.0...v1.15.0)

#### What's Changed

- Fix typos by
[@&#8203;waywardmonkeys](https://redirect.github.com/waywardmonkeys) in
[https://github.com/servo/rust-smallvec/pull/373](https://redirect.github.com/servo/rust-smallvec/pull/373)
- Implement bincode2 encode/decode support for smallvec v1 by
[@&#8203;markbt](https://redirect.github.com/markbt) in
[https://github.com/servo/rust-smallvec/pull/375](https://redirect.github.com/servo/rust-smallvec/pull/375)

#### New Contributors

- [@&#8203;markbt](https://redirect.github.com/markbt) made their first
contribution in
[https://github.com/servo/rust-smallvec/pull/375](https://redirect.github.com/servo/rust-smallvec/pull/375)

**Full Changelog**:
https://github.com/servo/rust-smallvec/compare/v1.14.0...v1.15.0

</details>

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---

Release Notes:

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Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>
0e72a7e6cerenovate[bot] committed on 4/9/2025, 11:37:32 PM· committed by GitHubparent3dc3ab0
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