Update clip to 1.8 (#3619)

packages/c/clip/xmake.lua

@@ -4,6 +4,7 @@ package("clip")
     set_license("MIT")
 
     set_urls("https://github.com/dacap/clip/archive/refs/tags/v$(version).zip")
+    add_versions("1.8", "9df8728c9ce7c3afcfc9a0c6718e064319f0cdffb927243ac1ca3be591578d00")
     add_versions("1.5", "4ed7f54184c27c79a8f2382ba747dce11aeb4552017abf5588587369a6caeb6b")
 
     add_deps("cmake", "libpng")