test(electrum): `fetch_prev_txout` does not process coinbase transact… #269

Job	Run time
Check no_std	16s
Build and test (stable, true, --no-default-features --features miniscript/no-std)	1m 28s
Build & Test Examples (example_cli)	18s
Build and test (stable, true, --all-features)	2m 30s
Check WASM	1m 1s
Build & Test Examples (example_bitcoind_rpc_polling)	37s
Rust fmt	11s
Build and test (1.63.0, --no-default-features --features miniscript/no-std)	2m 20s
Build & Test Examples (example_electrum)	52s
Build and test (1.63.0, --all-features)	2m 45s
Build & Test Examples (example_esplora)	59s
prepare	2s
Build & Test Examples (example_wallet_electrum)	53s
Build & Test Examples (example_wallet_esplora_async)	53s
Build & Test Examples (example_wallet_esplora_blocking)	54s
Build & Test Examples (example_wallet_rpc)	25s
clippy_check	57s
	17m 21s

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