Update protobuf-cpp to 28.1 (#5210)

packages/p/protobuf-cpp/xmake.lua

@@ -11,6 +11,7 @@ package("protobuf-cpp")
         end
     end})
 
+    add_versions("28.1", "0ac35978514f3e868181ea60237e695d892d4748ac03fb926a26ac7e2698aa29")
     add_versions("28.0", "979027233837dceaf927402e789261e46d4ff87ce45b3e38be8b15c4a1f696a3")
     add_versions("27.3", "a49147217f69e8d19aab0cc5c0059d6201261f5cb62145f8ab4ac8b94e7ffa86")
     add_versions("27.2", "7b4554f730a41f5c595cef3502038a69b8954c30d8ec9c62a167d5e1ebd8c210")