Bump reqwest from 0.12.19 to 0.12.20 #4996

Job	Run time
Shellcheck	3s
cargo-deny	54s
Rust Actions (Check/Fmt/Clippy) (macos-latest, clippy)	1m 49s
Rust Actions (Check/Fmt/Clippy) (ubuntu-latest, clippy)	2m 6s
Rust Actions (Check/Fmt/Clippy) (ubuntu-latest, fmt)	40s
buf	45s
Rust Actions (Check/Fmt/Clippy) (macos-latest, check)	2m 22s
Rust Actions (Check/Fmt/Clippy) (ubuntu-latest, check)	2m 11s
Integration Tests	2m 43s
Kani Proofs (lading_throttle)	1m 12s
Rust Actions (Check/Fmt/Clippy) (macos-latest, fmt)	1m 1s
Test Suite	9m 38s
action-sha-pin-check	8s
actionlint	8s
Kani Proofs (lading_payload)	1m 13s
	26m 53s

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