History of JobGroup::drop 1 change

In crates/flow/src/syscall.rs, lines 428–437 on cce63af9ec5421766cc5de5ded72e192f4cd981fbac972ccff2e8d2551822f0c. 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 428,437:crates/flow/src/syscall.rs.