CImg: update to v3.5.5 (#7181)

packages/c/cimg/xmake.lua

@@ -9,6 +9,7 @@ package("cimg")
     end})
     add_urls("https://github.com/greyclab/cimg.git")
 
+    add_versions("v3.5.5", "f202f71dd77a4434fc36725022912fb57098124b92c3c4f417155337dc1c57a0")
     add_versions("v3.5.4", "f3102efc0803cb52693b43adf759579feb3dbc018506a8004af5e29b40649ffb")
     add_versions("v3.5.3", "4b45e413a76ede23cb164fea74b4adc92500a873cfd87dd66cf8c93ce57ab627")
     add_versions("v3.5.2", "6ece3344b65cfcc30b286df9c621a66634c3a79da0b5041b4e01e3b33f2d22f1")