SomberNight 7611d4c3b3 scripts: fix "cannot schedule new futures after interpreter shutdown" ...

- looks like around python3.9, they changed it so that
  if we don't block on the main thread, it starts to shut things down
- polling thread.join() makes Ctrl+C work. kind of.

```
$ ./electrum/scripts/txradar.py 6bde84a981e72573666fcc51c81ec3f8f4a813709bf16451dce3f106a114d392
Exception in run: RuntimeError('cannot schedule new futures after interpreter shutdown')
Traceback (most recent call last):
  File "/home/user/wspace/electrum/electrum/util.py", line 1218, in wrapper
    return await func(*args, **kwargs)
  File "/home/user/wspace/electrum/electrum/interface.py", line 649, in wrapper_func
    return await func(self, *args, **kwargs)
  File "/home/user/wspace/electrum/electrum/interface.py", line 675, in run
    await self.open_session(ssl_context=ssl_context)
  File "/home/user/wspace/electrum/electrum/interface.py", line 872, in open_session
    async with _RSClient(
  File "/home/user/.local/lib/python3.10/site-packages/aiorpcx/rawsocket.py", line 167, in __aenter__
    _transport, protocol = await self.create_connection()
  File "/home/user/wspace/electrum/electrum/interface.py", line 285, in create_connection
    return await super().create_connection()
  File "/home/user/.local/lib/python3.10/site-packages/aiorpcx/rawsocket.py", line 163, in create_connection
    return await connector.create_connection(
  File "/usr/lib/python3.10/asyncio/base_events.py", line 1036, in create_connection
    infos = await self._ensure_resolved(
  File "/usr/lib/python3.10/asyncio/base_events.py", line 1418, in _ensure_resolved
    return await loop.getaddrinfo(host, port, family=family, type=type,
  File "/usr/lib/python3.10/asyncio/base_events.py", line 863, in getaddrinfo
    return await self.run_in_executor(
  File "/usr/lib/python3.10/asyncio/base_events.py", line 821, in run_in_executor
    executor.submit(func, *args), loop=self)
  File "/usr/lib/python3.10/concurrent/futures/thread.py", line 169, in submit
    raise RuntimeError('cannot schedule new futures after '
RuntimeError: cannot schedule new futures after interpreter shutdown
```

2025-07-15 12:00:31 +00:00

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