Bump bufbuild/buf-setup-action from 1.47.2 to 1.50.0 #3985

Job	Run time
actionlint	4s
action-sha-pin-check	36s
buf	9s
cargo-deny	32s
Integration Tests	4m 33s
Kani Proofs (lading_throttle)	1m 58s
Loom Proofs (lading_signal)	6m 6s
Rust Actions (Check/Fmt/Clippy) (ubuntu-latest)	1m 18s
Test Suite	6h 0m 15s
Kani Proofs (lading_payload)	1m 23s
Rust Actions (Check/Fmt/Clippy) (macos-latest)	54s
	6h 17m 48s

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