build(testenv): modify default feature #36

Job	Run time
prepare	3s
Rust fmt	14s
Check no_std	47s
Rust clippy	1m 21s
Build & Test (1.88.0, true, --no-default-features --features miniscript/no-std,bdk_chain/hashbrown)	2m 5s
Build & Test (1.88.0, true, --all-features)	3m 46s
Check WASM	1m 54s
Build & Test (1.63.0, --no-default-features --features miniscript/no-std,bdk_chain/hashbrown)	3m 25s
Build & Test (1.75.0, --all-features)	3m 57s
Build & Test (1.63.0, --all-features)	4m 40s
Build & Test (1.75.0, --no-default-features --features miniscript/no-std,bdk_chain/hashbrown)	2m 34s
Build & Test Examples (example_bitcoind_rpc_polling)	50s
Build & Test Examples (example_cli)	45s
Build & Test Examples (example_electrum)	1m 1s
Build & Test Examples (example_esplora)	1m 7s
	28m 29s

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