`ducks` adds backports and deprecated features #3471

Job	Run time
cargo-deny	32s
Rust Actions (Check/Fmt/Clippy) (ubuntu-latest)	47s
Rust Actions (Check/Fmt/Clippy) (macos-latest)	1m 10s
buf	6s
Integration Tests	3m 33s
Loom Proofs (lading_signal)	5m 39s
Kani Proofs (lading_throttle)	1m 0s
Test Suite	30m 35s
Kani Proofs (lading_payload)	1m 10s
actionlint	6s
action-sha-pin-check	39s
	45m 17s

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