fix: incorporate `Box`ed changeset in example_cli #5

Job	Run time
prepare	5s
Rust fmt	14s
Check no_std	22s
Build & Test (1.87.0, true, --all-features)	3m 42s
Build & Test (1.63.0, --all-features)	4m 25s
Build & Test (1.75.0, --all-features)	3m 52s
Check WASM	1m 35s
Build & Test (1.87.0, true, --no-default-features --features miniscript/no-std,bdk_chain/hashbrown)	2m 5s
Build & Test (1.75.0, --no-default-features --features miniscript/no-std,bdk_chain/hashbrown)	2m 23s
Rust clippy	1m 26s
Build & Test Examples (example_cli)	20s
Build & Test Examples (example_bitcoind_rpc_polling)	34s
Build & Test (1.63.0, --no-default-features --features miniscript/no-std,bdk_chain/hashbrown)	3m 44s
Build & Test Examples (example_esplora)	50s
Build & Test Examples (example_electrum)	53s
	26m 30s

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