Fix stale gossip retention Heisenbug when channel updates are slow.#1953

TheBlueMatt merged 2 commits intolightningdevkit:mainlightningdevkit/rust-lightning:mainfrom

arik-so:2023-01-debug-gossip-heisenbugarik-so/rust-lightning:2023-01-debug-gossip-heisenbugCopy head branch name to clipboard