fix(engineio): heartbeat delay #1128

Job	Run time
msrv	24s
feature_set	4m 43s
examples	36s
format	14s
rust-clippy-analyze	48s
test	1m 49s
udeps	52s
engine_io (v3)	35s
socket_io (v4)	38s
engine_io (v4)	38s
socket_io (v5)	43s
socket_io (v5-msgpack)	37s
adapter (v4, fred-e2e)	1m 19s
adapter (v4, redis-e2e)	1m 23s
adapter (v4, redis-cluster-e2e)	1m 17s
adapter (v4, fred-cluster-e2e)	1m 9s
adapter (v4-msgpack, fred-e2e)	1m 18s
adapter (v4-msgpack, redis-e2e)	1m 3s
adapter (v4-msgpack, redis-cluster-e2e)	1m 6s
adapter (v4-msgpack, fred-cluster-e2e)	1m 18s
adapter (v5, fred-e2e)	1m 7s
adapter (v5, redis-e2e)	1m 14s
adapter (v5, redis-cluster-e2e)	1m 9s
adapter (v5, fred-cluster-e2e)	1m 11s
adapter (v5-msgpack, fred-e2e)	1m 9s
adapter (v5-msgpack, redis-e2e)	1m 22s
adapter (v5-msgpack, redis-cluster-e2e)	1m 19s
adapter (v5-msgpack, fred-cluster-e2e)	1m 10s
all_passed	1s
	32m 12s

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