fix: correct cgroup path to jailer systemd scope - #218
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cargo audit found vulnerabilities:
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The jailer does not create a cgroup under /sys/fs/cgroup/csfx-firecracker/ as previously assumed (fixed in #214). It inherits the cgroup that systemd-run already created for the transient unit: /sys/fs/cgroup/system.slice/csfx-jailer-.service/. Confirmed on the running server via find and cgroup.procs.
Path corrected to derive from jailer_unit_name instead. No functional change beyond the path construction.