XCode升级到15运行，ImageResource文件名与系统库文件方法名冲突

[lxm1799]

Issue Description

XCode升级到15运行，ImageResource文件名与系统库GeneratedAssetSymbols.swift中的方法名名冲突

What

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Kingfisher version (7.2.4)

[Wei Wang]

Duplicated #2092 and already fixed in 7.8.0.

[Ishwar Hingu]

Use let resource = KF.ImageResource(downloadURL: url) instead of let resource = ImageResource(downloadURL: url)