/lib/systemd/system/cron-hourly.target is in systemd-cron 1.3.1+ds1-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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Description=systemd-cron hourly target
Documentation=man:systemd.cron(7)
Requires=cron-hourly.service
StopWhenUnneeded=yes
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