[PATCH v2 12/13] Update kernel version to 7.1 in header constant tests

[Florian Weimer]

* Adhemerval Zanella:

> There are no new constants covered by tst-mman-consts.py or
> tst-openat2-consts.py in Linux 6.18, 6.19, 7.0, or 7.1.

Okay.

Reviewed-by: Florian Weimer <fweimer@redhat.com>

Thanks,
Florian