fix(electrum): `bdk_electrum` exploit fixes #6279

Job	Run time
Rust fmt	9s
Check WASM	51s
Check no_std	27s
Build and test (stable, true, --no-default-features --features miniscript/no-std)	38s
Build and test (stable, true, --all-features)	54s
prepare	2s
Build and test (1.63.0, --no-default-features --features miniscript/no-std)	53s
Build and test (1.63.0, --all-features)	53s
Build & Test Examples (example_cli)	25s
Build & Test Examples (example_bitcoind_rpc_polling)	31s
Build & Test Examples (example_electrum)	39s
Build & Test Examples (example_esplora)	55s
Build & Test Examples (example_wallet_electrum)	48s
Build & Test Examples (example_wallet_esplora_async)	53s
Build & Test Examples (example_wallet_esplora_blocking)	52s
Build & Test Examples (example_wallet_rpc)	39s
clippy_check	48s
	11m 17s

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