The Feishu adapter wrapped lark-oapi's Connect() callable to inject
ping_interval/ping_timeout overrides, but made the wrapper async. The
underlying library uses Connect() as an async context manager (async
with Connect(...) as ws:), which requires the call itself to be sync
and return an AsyncContextManager — making it async meant the wrapper
was awaited eagerly and ws never bound.
Restoring the sync wrapper preserves the protocol while still injecting
the overrides.
Salvage of #25388 by @pearjelly (manually re-applied — original branch
was severely stale against current main).
71191b7e8e