chore(deps): update rust crates (#48)

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This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| [serde](https://serde.rs)
([source](https://togithub.com/serde-rs/serde)) | dependencies | patch |
`1.0.206` -> `1.0.208` |
| [serde_json](https://togithub.com/serde-rs/json) | dependencies |
patch | `1.0.124` -> `1.0.125` |
| [smol](https://togithub.com/smol-rs/smol) | dependencies | patch |
`2.0.0` -> `2.0.1` |
| [tokio](https://tokio.rs)
([source](https://togithub.com/tokio-rs/tokio)) | dependencies | patch |
`1.39.2` -> `1.39.3` |

---

### Release Notes

<details>
<summary>serde-rs/serde (serde)</summary>

###
[`v1.0.208`](https://togithub.com/serde-rs/serde/releases/tag/v1.0.208)

[Compare
Source](https://togithub.com/serde-rs/serde/compare/v1.0.207...v1.0.208)

- Support serializing and deserializing unit structs in a `flatten`
field ([#&#8203;2802](https://togithub.com/serde-rs/serde/issues/2802),
thanks [@&#8203;jonhoo](https://togithub.com/jonhoo))

###
[`v1.0.207`](https://togithub.com/serde-rs/serde/releases/tag/v1.0.207)

[Compare
Source](https://togithub.com/serde-rs/serde/compare/v1.0.206...v1.0.207)

- Improve interactions between `flatten` attribute and
`skip_serializing`/`skip_deserializing`
([#&#8203;2795](https://togithub.com/serde-rs/serde/issues/2795), thanks
[@&#8203;Mingun](https://togithub.com/Mingun))

</details>

<details>
<summary>serde-rs/json (serde_json)</summary>

###
[`v1.0.125`](https://togithub.com/serde-rs/json/releases/tag/1.0.125)

[Compare
Source](https://togithub.com/serde-rs/json/compare/v1.0.124...1.0.125)

- Speed up \uXXXX parsing and improve handling of unpaired surrogates
when deserializing to bytes
([#&#8203;1172](https://togithub.com/serde-rs/json/issues/1172),
[#&#8203;1175](https://togithub.com/serde-rs/json/issues/1175), thanks
[@&#8203;purplesyringa](https://togithub.com/purplesyringa))

</details>

<details>
<summary>smol-rs/smol (smol)</summary>

###
[`v2.0.1`](https://togithub.com/smol-rs/smol/blob/HEAD/CHANGELOG.md#Version-201)

[Compare
Source](https://togithub.com/smol-rs/smol/compare/v2.0.0...v2.0.1)

- Add a mention to the documentation of `smol::spawn` that tasks spawned
with
this function don't have their destructors called when the program ends.
([#&#8203;312](https://togithub.com/smol-rs/smol/issues/312))

</details>

<details>
<summary>tokio-rs/tokio (tokio)</summary>

###
[`v1.39.3`](https://togithub.com/tokio-rs/tokio/releases/tag/tokio-1.39.3):
Tokio v1.39.3

[Compare
Source](https://togithub.com/tokio-rs/tokio/compare/tokio-1.39.2...tokio-1.39.3)

### 1.39.3 (August 17th, 2024)

This release fixes a regression where the unix socket api stopped
accepting the abstract socket namespace. ([#&#8203;6772])

[#&#8203;6772]: https://togithub.com/tokio-rs/tokio/pull/6772

</details>

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