History of hmac 1 change

In crates/hub/src/backups.rs, lines 440–445 on 09ffa7b600a913f425e49a1c43cc9ca255b7cbf28d256bd91c16d1aa76392a14. Every change that wrote or deleted one of these lines, or deleted a line from between them. Exact, because each line keeps its identity across edits; edits elsewhere in the file are not here. Also: oxy log -L 440,445:crates/hub/src/backups.rs.