Fix deprecated asyncio.get_event_loop() in wait_for_text

[gnodet]

Summary

wait_for_text() in server.py uses asyncio.get_event_loop() which is deprecated since Python 3.10 and emits a DeprecationWarning in Python 3.12+. It will eventually be removed.

Current code

loop = asyncio.get_event_loop()
deadline = loop.time() + timeout

Fix

loop = asyncio.get_running_loop()
deadline = loop.time() + timeout

Since wait_for_text is an async function, there is always a running event loop when it executes, so get_running_loop() is the correct replacement.

Size

XS — single line change.