fix: unwrap connection for boxed stream #4914

Job	Run time
Build	3m 25s
Test example js-libp2p-example-chat	5m 9s
Test example js-libp2p-example-circuit-relay	4m 56s
Test example js-libp2p-example-browser-pubsub	3m 30s
Test example js-libp2p-example-custom-protocols	2m 46s
Test example js-libp2p-example-discovery-mechanisms	5m 4s
Test example js-libp2p-example-peer-and-content-routing	2m 52s
Test example js-libp2p-example-delegated-routing	3m 15s
Test example js-libp2p-example-connection-encryption	3m 10s
Test example js-libp2p-example-pnet	1m 23s
Test example js-libp2p-example-protocol-and-stream-muxing	1m 22s
Test example js-libp2p-example-pubsub	3m 21s
Test example js-libp2p-example-transports	2m 0s
Test example js-libp2p-example-webrtc-private-to-private	1m 59s
	44m 12s

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