chore(chain,wallet): fix build warnings #1412

Job	Run time
Build and test (stable, true, --no-default-features --features miniscript/no-std)	1m 35s
Build & Test Examples (example_cli)	19s
Check no_std	13s
Build and test (stable, true, --all-features)	3m 58s
Build & Test Examples (example_bitcoind_rpc_polling)	25s
Build and test (1.63.0, --no-default-features --features miniscript/no-std)	2m 5s
Check WASM	37s
Build & Test Examples (example_electrum)	49s
Build and test (1.63.0, --all-features)	5m 17s
Rust fmt	6s
Build & Test Examples (example_esplora)	51s
prepare	10s
Build & Test Examples (example_wallet_electrum)	47s
Build & Test Examples (example_wallet_esplora_async)	1m 6s
Build & Test Examples (example_wallet_esplora_blocking)	49s
Build & Test Examples (example_wallet_rpc)	40s
clippy_check	35s
	20m 22s

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