Update xmake.lua (#1844)

add poco 1.11.6 and 1.12.4, just some fix updates

packages/p/poco/xmake.lua

@@ -8,8 +8,10 @@ package("poco")
              "https://github.com/pocoproject/poco.git")
     add_versions("1.11.0", "8a7bfd0883ee95e223058edce8364c7d61026ac1882e29643822ce9b753f3602")
     add_versions("1.11.1", "2412a5819a239ff2ee58f81033bcc39c40460d7a8b330013a687c8c0bd2b4ac0")
+    add_versions("1.11.6", "ef0ac1bd1fe4d84b38cde12fbaa7a441d41bfbd567434b9a57ef8b79a8367e74")
     add_versions("1.12.1", "debc6d5d5eb946bb14e47cffc33db4fffb4f11765f34f8db04e71e866d1af8f9")
     add_versions("1.12.2", "30442ccb097a0074133f699213a59d6f8c77db5b2c98a7c1ad9c5eeb3a2b06f3")
+    add_versions("1.12.4", "71ef96c35fced367d6da74da294510ad2c912563f12cd716ab02b6ed10a733ef")
 
     if is_plat("windows") then
         add_configs("shared", {description = "Build shared library.", default = false, type = "boolean", readonly = true})