chore(deps): update dependency onevcat/kingfisher to from: "7.9.0"

This PR contains the following updates:

Package	Update	Change
onevcat/Kingfisher	minor	`from: "7.8.1"` -> `from: "7.9.0"`

Release Notes

onevcat/Kingfisher (onevcat/Kingfisher)

### [`v7.9.0`](https://togithub.com/onevcat/Kingfisher/blob/HEAD/CHANGELOG.md#790---visionOS--Xcode-15-2023-07-29) [Compare Source](https://togithub.com/onevcat/Kingfisher/compare/7.8.1...7.9.0) ##### Add - Add visionOS as support target. Now Kingfisher can run natively on visionOS, in both UIKit or SwiftUI mode. [#2103](https://togithub.com/onevcat/Kingfisher/pull/2103) - Add private manifest file (`PrivacyInfo.xcprivacy`) to the project to meet Apple's requirement of describing data collected and use of required reason API. [#2104](https://togithub.com/onevcat/Kingfisher/pull/2104) - Support digital signature in xcframework. Now the xcframework of Kingfisher is signed with the Apple Developer ID of the maintainer team. [#2106](https://togithub.com/onevcat/Kingfisher/pull/2106) - A public initializer of `ImageDownloadResult`. This allows overriding side to construct and return a valid download result. [#2107](https://togithub.com/onevcat/Kingfisher/pull/2107) [@kmaschke85](https://togithub.com/kmaschke85) ##### Fix - Some documentation fixes. ***