/etc/cron.daily/installation-birthday is in installation-birthday 8.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 5 | #!/bin/sh
[ -x /usr/bin/installation-birthday ] || exit 0
exec /usr/bin/installation-birthday --verbosity=0
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