build(testenv): modify default feature #34

Job	Run time
prepare	5s
Rust fmt	15s
Check WASM	2m 21s
Check no_std	50s
Rust clippy	1m 20s
Build & Test (1.63.0, --all-features)	1m 41s
Build & Test (1.88.0, true, --no-default-features --features miniscript/no-std,bdk_chain/hashbrown)	1m 26s
Build & Test (1.63.0, --no-default-features --features miniscript/no-std,bdk_chain/hashbrown)	1m 40s
Build & Test (1.88.0, true, --all-features)	1m 41s
Build & Test Examples (example_esplora)	1m 3s
Build & Test Examples (example_electrum)	1m 1s
Build & Test (1.75.0, --all-features)	1m 40s
Build & Test Examples (example_bitcoind_rpc_polling)	50s
Build & Test (1.75.0, --no-default-features --features miniscript/no-std,bdk_chain/hashbrown)	1m 38s
Build & Test Examples (example_cli)	49s
	18m 20s

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