History of S3::creds 1 change

In crates/hub/src/backups.rs, lines 540–584 on 80642fde09cc3932f252db2388d4e84b5ea6e36f59f345ce13117e8db11e036b. 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.