Update Rust crate hyper-util to v0.1.15 (#14595)

This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| [hyper-util](https://hyper.rs)
([source](https://redirect.github.com/hyperium/hyper-util)) |
dev-dependencies | patch | `0.1.14` -> `0.1.15` |

---

> [!WARNING]
> Some dependencies could not be looked up. Check the Dependency
Dashboard for more information.

---

### Release Notes

<details>
<summary>hyperium/hyper-util (hyper-util)</summary>

###
[`v0.1.15`](https://redirect.github.com/hyperium/hyper-util/blob/HEAD/CHANGELOG.md#0115-2025-07-07)

[Compare
Source](https://redirect.github.com/hyperium/hyper-util/compare/v0.1.14...v0.1.15)

- Add header casing options to `auto::Builder`.
- Fix `proxy::Socksv5` to check for enough bytes before parsing ipv6
responses.
- Fix including `client-proxy` in the `full` feature set.

</details>

---

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Cargo.lock

@@ -1703,9 +1703,9 @@ dependencies = [
 
 [[package]]
 name = "hyper-util"
-version = "0.1.14"
+version = "0.1.15"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "dc2fdfdbff08affe55bb779f33b053aa1fe5dd5b54c257343c17edfa55711bdb"
+checksum = "7f66d5bd4c6f02bf0542fad85d626775bab9258cf795a4256dcaf3161114d1df"
 dependencies = [
  "base64 0.22.1",
  "bytes",