update concurrencpp to 0.1.6 (#2095)

packages/c/concurrencpp/xmake.lua

@@ -8,6 +8,7 @@ package("concurrencpp")
     end})
     add_urls("https://github.com/David-Haim/concurrencpp.git")
     add_versions("0.1.5", "330150ebe11b3d30ffcb3efdecc184a34cf50a6bd43b68e294a496225d286651")
+    add_versions("0.1.6", "e7d5c23a73ff1d7199d361d3402ad2a710dfccf7630b622346df94a7532b4221")
 
     add_deps("cmake")