The soft limits cannot go above the hard limits values, so the hard
limits should be configured too, just in case default limits values set
by the kernel or the init process are too small.
E.g. when booting with `init=/bin/sh` we have:
$ cat /proc/1/limits
Limit Soft Limit Hard Limit Units
...
Max open files 1024 4096 files
...
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/35126>
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