Allow missing BackendKeyData message & enforce cancel key length

When Who What
2025-08-23 22:04:20 Jelte Fennema-Nio (jeltef) Closed in commitfest PG19-2 with status: Committed
2025-08-23 22:04:20 Jelte Fennema-Nio (jeltef) Changed committer to heikki
2025-08-23 13:53:21 CFbot Patch needs rebase
2025-08-14 13:33:24 CFbot Patch does not need rebase anymore
2025-08-02 00:18:22 CFbot Patch needs rebase
2025-08-01 22:23:22 Jelte Fennema-Nio (jeltef) Changed name to Allow missing BackendKeyData message & enforce cancel key length
2025-08-01 22:21:17 Jelte Fennema-Nio (jeltef) Moved from CF PG19-1 to CF PG19-2
2025-06-26 13:34:58 Jelte Fennema-Nio (jeltef) Attached mail thread 20250617.101056.1437027795118961504.ishii@postgresql.org
2025-06-26 13:34:58 Jelte Fennema-Nio (jeltef) Created patch record