The conflict-retry path called asyncio.get_event_loop() to reschedule
itself when a retry's start_polling raised. On Python 3.11+ (our floor)
that raises 'RuntimeError: There is no current event loop in thread
MainThread' when no loop is attached to the thread, which is what
happens when PTB dispatches this error callback. The retry never gets
scheduled, the adapter goes silent-but-alive, and gateway --replace
keeps spawning fresh instances that hit the same wall — the crash loop
reported in #19471 (worse under multi-profile, where two bots hold the
same conflict open).
We are inside a coroutine here, so asyncio.get_running_loop() is the
correct, guaranteed-valid replacement. Only get_event_loop() call in
any platform adapter, so no sibling sites.
Fixes#19471
2e62862784