Update xmake.lua (#926)

packages/i/imgui/xmake.lua

@@ -6,6 +6,7 @@ package("imgui")
     add_urls("https://github.com/ocornut/imgui/archive/$(version).tar.gz",
              "https://github.com/ocornut/imgui.git")
 
+    add_versions("v1.86", "6ba6ae8425a19bc52c5e067702c48b70e4403cd339cba02073a462730a63e825")
     add_versions("v1.85-docking", "dc8c3618e8f8e2dada23daa1aa237626af341fd8")
     add_versions("v1.85", "7ed49d1f4573004fa725a70642aaddd3e06bb57fcfe1c1a49ac6574a3e895a77")
     add_versions("v1.84.2", "35cb5ca0fb42cb77604d4f908553f6ef3346ceec4fcd0189675bdfb764f62b9b")