chore(deps): update dependency onevcat/kingfisher to from: "8.6.0" (#1851)

This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
| [onevcat/Kingfisher](https://redirect.github.com/onevcat/Kingfisher) |
minor | `from: "8.5.0"` -> `from: "8.6.0"` |

---

### Release Notes

<details>
<summary>onevcat/Kingfisher (onevcat/Kingfisher)</summary>

###
[`v8.6.0`](https://redirect.github.com/onevcat/Kingfisher/blob/HEAD/CHANGELOG.md#860---Retryfisher-2025-10-05)

[Compare
Source](https://redirect.github.com/onevcat/Kingfisher/compare/8.5.0...8.6.0)

##### Add

- Add network retry strategy with configurable retry logic for failed
downloads.
[#&#8203;2439](https://redirect.github.com/onevcat/Kingfisher/pull/2439)
[@&#8203;komkovla](https://redirect.github.com/komkovla)
- Add network metrics collection for download tasks with download speed
measurement and timestamp handling.
[#&#8203;2416](https://redirect.github.com/onevcat/Kingfisher/pull/2416)
[@&#8203;darkbrewx](https://redirect.github.com/darkbrewx)

##### Fix

- Fix crash on setting indicator on macOS 26 by changing default
indicator style.
[#&#8203;2442](https://redirect.github.com/onevcat/Kingfisher/pull/2442)
[@&#8203;onevcat](https://redirect.github.com/onevcat)
- Fix retain cycle in ImageDownloader when transferring network metrics.
[#&#8203;2419](https://redirect.github.com/onevcat/Kingfisher/pull/2419)
[@&#8203;darkbrewx](https://redirect.github.com/darkbrewx)
- Upgrade to the latest Xcode recommended settings for improved build
configuration.
[#&#8203;2417](https://redirect.github.com/onevcat/Kingfisher/pull/2417)
[@&#8203;onevcat](https://redirect.github.com/onevcat)
- Update CI script to make it work with Xcode 26.
[#&#8203;2442](https://redirect.github.com/onevcat/Kingfisher/pull/2442)
[@&#8203;onevcat](https://redirect.github.com/onevcat)

***

</details>

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examples/messagekit_example/Package.resolved

@@ -6,6 +6,6 @@ let package = Package(
     name: "messagekit_example",
     dependencies: [
         .package(url: "https://github.com/MessageKit/MessageKit", from: "5.0.0"),
-        .package(url: "https://github.com/onevcat/Kingfisher", from: "8.5.0"),
+        .package(url: "https://github.com/onevcat/Kingfisher", from: "8.6.0"),
     ]
 )