Update protobuf-cpp to 27.3 (#4822)

packages/p/protobuf-cpp/xmake.lua

@@ -11,6 +11,7 @@ package("protobuf-cpp")
         end
     end})
 
+    add_versions("27.3", "a49147217f69e8d19aab0cc5c0059d6201261f5cb62145f8ab4ac8b94e7ffa86")
     add_versions("27.2", "7b4554f730a41f5c595cef3502038a69b8954c30d8ec9c62a167d5e1ebd8c210")
     add_versions("27.0", "3e1148db090ff21226c1888ef39fa7bc7790042be21ff4289fd21ce1735f3455")
     add_versions("26.1", "e15c272392df84ae95797759c685a9225fe5e88838bab3e0650c29239bdfccdd")