GHSA-C827-HFW6-QWVM rustix's `rustix::fs::Dir` iterator with the `linux_raw` backend can cause memory explosion

Summary When using rustix::fs::Dir using the linuxraw backend, it's possible for the iterator to "get stuck" when an IO error is encountered. Combined with a memory over-allocation issue in rustix::fs::Dir::readmore, this can cause quick and unbounded memory explosion gigabytes in a few seconds i...