chore(deps): update rust crate chrono to 0.4.38 (#549)

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This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| [chrono](https://togithub.com/chronotope/chrono) | dev-dependencies |
patch | `0.4.37` -> `0.4.38` |

---

### Release Notes

<details>
<summary>chronotope/chrono (chrono)</summary>

###
[`v0.4.38`](https://togithub.com/chronotope/chrono/releases/tag/v0.4.38)

[Compare
Source](https://togithub.com/chronotope/chrono/compare/v0.4.37...v0.4.38)

This release bring a ca. 20% improvement to the performance of the
formatting code, and a convenient `days_since` method for the `Weekday`
type.

Chrono 0.4.38 also removes the long deprecated `rustc-serialize`
feature. Support for `rustc-serialize` will be [soft-destabilized in the
next Rust edition](https://togithub.com/rust-lang/rust/pull/116016).
Removing the feature will not break existing users of the feature; Cargo
will just not update dependents that rely on it to newer versions of
chrono.

In chrono 0.4.36 we made an accidental breaking change by switching to
`derive(Copy)` for `DateTime` instead of a manual implementation. It is
reverted in this release.

##### Removals

- Remove `rustc-serialize` feature
([#&#8203;1548](https://togithub.com/chronotope/chrono/issues/1548),
thanks [@&#8203;workingjubilee](https://togithub.com/workingjubilee))

##### Additions

- Add `Weekday::days_since`
([#&#8203;1249](https://togithub.com/chronotope/chrono/issues/1249),
based on
[#&#8203;216](https://togithub.com/chronotope/chrono/issues/216) by
[@&#8203;clarfonthey](https://togithub.com/clarfonthey))
- Add `TimeDelta::checked_mul` and `TimeDelta::checked_div`
([#&#8203;1565](https://togithub.com/chronotope/chrono/issues/1565),
thanks [@&#8203;Zomtir](https://togithub.com/Zomtir))

##### Fixes

- Return error when rounding with a zero duration
([#&#8203;1474](https://togithub.com/chronotope/chrono/issues/1474),
thanks [@&#8203;Dav1dde](https://togithub.com/Dav1dde))
- Manually implement `Copy` for `DateTime` if offset is `Copy`
([#&#8203;1573](https://togithub.com/chronotope/chrono/issues/1573))

##### Internal

- Inline `test_encodable_json` and `test_decodable_json` functions
([#&#8203;1550](https://togithub.com/chronotope/chrono/issues/1550))
- CI: Reduce combinations in `cargo hack check`
([#&#8203;1553](https://togithub.com/chronotope/chrono/issues/1553))
- Refactor formatting code
([#&#8203;1335](https://togithub.com/chronotope/chrono/issues/1335))
- Optimize number formatting
([#&#8203;1558](https://togithub.com/chronotope/chrono/issues/1558))
- Only package files needed for building and testing
([#&#8203;1554](https://togithub.com/chronotope/chrono/issues/1554))

Thanks to all contributors on behalf of the chrono team,
[@&#8203;djc](https://togithub.com/djc) and
[@&#8203;pitdicker](https://togithub.com/pitdicker)!

</details>

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Cargo.toml

@@ -85,7 +85,7 @@ tonic = { version = "0.11", features = [
 tonic-types = { version = "0.11", optional = true }
 
 [dev-dependencies]
-chrono = "0.4.37"
+chrono = "0.4.38"
 tokio = { version = "1", features = ["macros", "rt-multi-thread"] }
 tower = { version = "0.4.13" }