docker:doc: Fix build perl-modules
trixie now provides two perl-modules packages and we have to specify which one we need:
2.645 Reading state information... 2.674 Package perl-modules is a virtual package provided by: 2.674 perl-modules-5.40 5.40.0-6 2.674 perl-modules-5.38 5.38.2-5 2.674 2.678 E: Package 'perl-modules' has no installation candidate
Signed-off-by: Ricardo Ribalda ribalda@chromium.org