chore(deps): update rust crate tokio to v1.40.0 (#405)

This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| [tokio](https://tokio.rs) ([source](https://redirect.github.com/tokio-rs/tokio)) | workspace.dependencies | minor | `1.39.3` -> `1.40.0` |

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### Release Notes

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

### [`v1.40.0`](https://redirect.github.com/tokio-rs/tokio/releases/tag/tokio-1.40.0): Tokio v1.40.0

[Compare Source](https://redirect.github.com/tokio-rs/tokio/compare/tokio-1.39.3...tokio-1.40.0)

### 1.40.0 (August 30th, 2024)

##### Added

-   io: add `util::SimplexStream` ([#&#8203;6589])
-   process: stabilize `Command::process_group` ([#&#8203;6731])
-   sync: add `{TrySendError,SendTimeoutError}::into_inner` ([#&#8203;6755])
-   task: add `JoinSet::join_all` ([#&#8203;6784])

##### Added (unstable)

-   runtime: add `Builder::{on_task_spawn, on_task_terminate}` ([#&#8203;6742])

##### Changed

-   io: use vectored io for `write_all_buf` when possible ([#&#8203;6724])
-   runtime: prevent niche-optimization to avoid triggering miri ([#&#8203;6744])
-   sync: mark mpsc types as `UnwindSafe` ([#&#8203;6783])
-   sync,time: make `Sleep` and `BatchSemaphore` instrumentation explicit roots ([#&#8203;6727])
-   task: use `NonZeroU64` for `task::Id` ([#&#8203;6733])
-   task: include panic message when printing `JoinError` ([#&#8203;6753])
-   task: add `#[must_use]` to `JoinHandle::abort_handle` ([#&#8203;6762])
-   time: eliminate timer wheel allocations ([#&#8203;6779])

##### Documented

-   docs: clarify that `[build]` section doesn't go in Cargo.toml ([#&#8203;6728])
-   io: clarify zero remaining capacity case ([#&#8203;6790])
-   macros: improve documentation for `select!` ([#&#8203;6774])
-   sync: document mpsc channel allocation behavior ([#&#8203;6773])

[#&#8203;6589]: https://redirect.github.com/tokio-rs/tokio/pull/6589

[#&#8203;6724]: https://redirect.github.com/tokio-rs/tokio/pull/6724

[#&#8203;6727]: https://redirect.github.com/tokio-rs/tokio/pull/6727

[#&#8203;6728]: https://redirect.github.com/tokio-rs/tokio/pull/6728

[#&#8203;6731]: https://redirect.github.com/tokio-rs/tokio/pull/6731

[#&#8203;6733]: https://redirect.github.com/tokio-rs/tokio/pull/6733

[#&#8203;6742]: https://redirect.github.com/tokio-rs/tokio/pull/6742

[#&#8203;6744]: https://redirect.github.com/tokio-rs/tokio/pull/6744

[#&#8203;6753]: https://redirect.github.com/tokio-rs/tokio/pull/6753

[#&#8203;6755]: https://redirect.github.com/tokio-rs/tokio/pull/6755

[#&#8203;6762]: https://redirect.github.com/tokio-rs/tokio/pull/6762

[#&#8203;6773]: https://redirect.github.com/tokio-rs/tokio/pull/6773

[#&#8203;6774]: https://redirect.github.com/tokio-rs/tokio/pull/6774

[#&#8203;6779]: https://redirect.github.com/tokio-rs/tokio/pull/6779

[#&#8203;6783]: https://redirect.github.com/tokio-rs/tokio/pull/6783

[#&#8203;6784]: https://redirect.github.com/tokio-rs/tokio/pull/6784

[#&#8203;6790]: https://redirect.github.com/tokio-rs/tokio/pull/6790

</details>

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