bind_threads does not work on 64bit linux

[mawenzy]

Last part of error message:

    data = brine.I4I4.pack(this_thread.id, this_thread._remote_thread_id) + data
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
struct.error: 'L' format requires 0 <= number <= 4294967295

Environment

• rpyc 5.3.0
• python 3.11
• fedora linux 37

Minimal example

Try to send any message.