History of JobGroup::drop 1 change

In crates/flow/src/syscall.rs, lines 458–467 on c59b9660678ccd9e5773666a2c29d30855ec8ed147b026a55da7a6deedde048b. 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 458,467:crates/flow/src/syscall.rs.