Use Linux 6.15 in build-many-glibcs.py

[Florian Weimer]

* Joseph Myers:

> Tested with build-many-glibcs.py (host-libraries, compilers and glibcs
> builds).
>
> diff --git a/scripts/build-many-glibcs.py b/scripts/build-many-glibcs.py
> index 28258e372c..1dcc9bf0e4 100755
> --- a/scripts/build-many-glibcs.py
> +++ b/scripts/build-many-glibcs.py
> @@ -831,7 +831,7 @@ class Context(object):
>                              'gcc': 'vcs-14',
>                              'glibc': 'vcs-mainline',
>                              'gmp': '6.3.0',
> -                            'linux': '6.14',
> +                            'linux': '6.15',
>                              'mpc': '1.3.1',
>                              'mpfr': '4.2.2',
>                              'mig': 'vcs-mainline',

Okay.

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

Florian