History of S3::creds 1 change

In crates/hub/src/backups.rs, lines 540–584 on 668b2ad7495ce300ca09b4436b280dfd9a141febdf0f93ee420ac08c9f9b6fd5. 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 540,584:crates/hub/src/backups.rs.