Change default tx to version 2 #6586

Job	Run time
prepare	2s
Check no_std	46s
Build & Test Examples (example_cli)	45s
Build & Test Examples (example_bitcoind_rpc_polling)	45s
Build and test (1.83.0, true, --no-default-features --features miniscript/no-std)	2m 47s
Check WASM	1m 15s
Build & Test Examples (example_electrum)	59s
Build and test (1.83.0, true, --all-features)	4m 3s
clippy_check	1m 33s
Build and test (1.63.0, --no-default-features --features miniscript/no-std)	5m 16s
Build & Test Examples (example_esplora)	1m 0s
Build and test (1.63.0, --all-features)	6m 27s
Rust fmt	13s
Build & Test Examples (example_wallet_electrum)	57s
Build & Test Examples (example_wallet_esplora_async)	1m 3s
Build & Test Examples (example_wallet_esplora_blocking)	1m 0s
Build & Test Examples (example_wallet_rpc)	45s
	29m 36s

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