ci: apply `zizmor` security audit #6688

Job	Run time
prepare	4s
Check no_std	32s
Build & Test (1.84.0, true, --no-default-features --features miniscript/no-std)	48s
Build & Test (1.84.0, true, --all-features)	49s
Check WASM	1m 2s
Build & Test (1.63.0, --no-default-features --features miniscript/no-std)	46s
Rust fmt	12s
Build & Test (1.63.0, --all-features)	32s
Build & Test Examples (example_cli)	29s
Build & Test (1.75.0, --no-default-features --features miniscript/no-std)	46s
Rust clippy	1m 3s
Build & Test Examples (example_bitcoind_rpc_polling)	36s
Build & Test (1.75.0, --all-features)	48s
Build & Test Examples (example_electrum)	1m 1s
Build & Test Examples (example_esplora)	53s
Build & Test Examples (example_wallet_electrum)	57s
Build & Test Examples (example_wallet_esplora_async)	1m 9s
Build & Test Examples (example_wallet_esplora_blocking)	54s
Build & Test Examples (example_wallet_rpc)	36s
	13m 57s

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