[fix](compile) failed on MacOS because size_t is not uint64_t on MacOS (#39296) (#40720)

pick #39296 to branch-2.1

Co-authored-by: morrySnow <101034200+morrySnow@users.noreply.github.com>

be/src/vec/aggregate_functions/aggregate_function_window_funnel.h

@@ -347,7 +347,7 @@ struct WindowFunnelState {
             read_var_int(mode, in);
             window_funnel_mode = static_cast<WindowFunnelMode>(mode);
         }
-        size_t data_bytes = 0;
+        uint64_t data_bytes = 0;
         read_var_uint(data_bytes, in);
         std::string buff;
         buff.resize(data_bytes);