chore(deps): update rust crate tower to v0.5.1 (#59)

This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| [tower](https://redirect.github.com/tower-rs/tower) | dev-dependencies
| patch | `0.5.0` -> `0.5.1` |

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### Release Notes

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

###
[`v0.5.1`](https://redirect.github.com/tower-rs/tower/releases/tag/tower-0.5.1):
tower 0.5.1

[Compare
Source](https://redirect.github.com/tower-rs/tower/compare/tower-0.5.0...tower-0.5.1)

-   Fix minimum version of `tower-layer` dependency ([#&#8203;787])

[#&#8203;787]: https://redirect.github.com/tower-rs/tower/pull/787

</details>

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