CI: Drop bin86/dev86 from archlinux container

These packages have moved out of main to AUR, and are not easily accessible
any more.  Drop them, because they're only needed for RomBIOS which is very
legacy these days.

Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com>
Reviewed-by: Roger Pau Monné <roger.pau@citrix.com>
Reviewed-by: Anthony PERARD <anthony.perard@vates.tech>
Acked-by: Stefano Stabellini <sstabellini@kernel.org>

automation/build/archlinux/current.dockerfile

@@ -6,10 +6,8 @@ LABEL maintainer.name="The Xen Project" \
 RUN pacman-key --init
 
 RUN pacman -S --refresh --sysupgrade --noconfirm --noprogressbar --needed \
-        bin86 \
         bridge-utils \
         bzip2 \
-        dev86 \
         discount \
         dtc \
         e2fsprogs \