Install x11-base/xorg-server 21.1.7 on gentoo

[radarhere]

gentoo has started failing on main - https://github.com/python-pillow/docker-images/actions/runs/4211074983/jobs/7309181054#step:6:344

!!! Multiple package instances within a single package slot have been pulled
!!! into the dependency graph, resulting in a slot conflict:

x11-base/xorg-server:0

(x11-base/xorg-server-21.1.7:0/21.1.7::gentoo, ebuild scheduled for merge) USE="elogind udev xorg xvfb -debug -minimal (-selinux) -suid -systemd -test -unwind -xcsecurity -xephyr -xnest" ABI_X86="(64)" pulled in by
x11-base/xorg-server[xvfb] required by (x11-misc/xvfb-run-1.20.10.3:0/0::gentoo, ebuild scheduled for merge) USE="" ABI_X86="(64)"
^^^^

(x11-base/xorg-server-21.1.6-1:0/21.1.6::gentoo, binary scheduled for merge) USE="systemd udev xorg -debug -elogind -minimal (-selinux) -suid -test -unwind -xcsecurity -xephyr -xnest -xvfb" ABI_X86="(64)" pulled in by
x11-base/xorg-server:0/21.1.6= required by (x11-drivers/xf86-video-ati-19.1.0-r1-6:0/0::gentoo, binary scheduled for merge) USE="udev" ABI_X86="(64)"
^^^^^^^^^^
(and 6 more with the same problem)

Looking at that, I tried installing =x11-base/xorg-server-21.1.7, and that fixes it.

[radarhere]

The arch failure is also happening on main.

It looks like just a 404 problem, so I'm hoping it will resolve itself - https://github.com/python-pillow/docker-images/actions/runs/4228063478/jobs/7343132285#step:6:142

[radarhere]

arch is working again - https://github.com/python-pillow/docker-images/actions/runs/4238403687/jobs/7365438016