79f297834a
#49431 corrected parents[2]->parents[3] for discord + raft only. The same
bug existed in slack, whatsapp, and telegram adapters (migrated from
gateway/platforms/ in 5600105478): each inserts parents[2] = plugins/ onto
sys.path[0], shadowing the real cron/ package with plugins/cron/ so
'import cron.scheduler_provider' raises ModuleNotFoundError on gateway start.
Fixes #49410, #49824.