chore(deps): bump actions/checkout from 1 to 4 #6161

Job	Run time
Build and test (stable, true, --no-default-features --features miniscript/no-std)	1m 21s
Build & Test Examples (example_cli)	19s
Build and test (stable, true, --all-features)	3m 45s
Build & Test Examples (example_bitcoind_rpc_polling)	26s
Check no_std	17s
Check WASM	48s
Build & Test Examples (example_electrum)	48s
Build and test (1.63.0, --no-default-features --features miniscript/no-std)	1m 51s
Build & Test Examples (example_esplora)	48s
Build and test (1.63.0, --all-features)	4m 38s
Build & Test Examples (example_wallet_electrum)	47s
prepare	6s
Rust fmt	6s
Build & Test Examples (example_wallet_esplora_async)	58s
Build & Test Examples (example_wallet_esplora_blocking)	52s
Build & Test Examples (example_wallet_rpc)	25s
clippy_check	27s
	18m 42s

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