Revert "reproducible Debian: reshuffle arm64 builders, reduce from 32 to 25...

Revert "reproducible Debian: reshuffle arm64 builders, reduce from 32 to 25 (which is 6 more than autodown creates) and mark nodes sled10 & 13 as constantly down (all of this is hopefully temporarily)"

This reverts commit c3cd0018.

Signed-off-by: Mattia Rizzolo <mattia@debian.org>