mpconfig: Use RUN_BACKGROUND_TASKS as the micropython event hook #10379
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This is a newer abstraction in micropython; it'll for instance allow background tasks to be checked once per ms in the internal select module modselect.
Because
MICROPY_INTERNAL_EVENT_HOOK
is used in a few locations, our own CIRCUITPY-CHANGE call toRUN_BACKGROUND_TASKS
can be nixed. Specifically,mp_event_handle_nowait
callsMICROPY_INTERNAL_EVENT_HOOK
so paths from it don't needRUN_BACKGROUND_TASKS
anymore.However, while I'm traveling, I don't have access to hardware, so this is actually untested.