History of S3::creds 1 change

In crates/hub/src/backups.rs, lines 540–584 on 107eaba52c9d9a3f7f363ef1801dac423bc0f01c0da8bfe608799b12038a0489. 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.