update-perl-modules: Hard-code the Test::Harness version to 3.30

This finally fixes the

    Can't locate object method "new" via package "TAP::Harness::Archive" at
    /usr/lib/perl5/site_perl/5.8/TAP/Harness/Archive.pm line 96.

error.

Signed-off-by: Sebastian Schuberth <sschuberth@gmail.com>