ports-mgmt/portupgrade*: Revert "Use databases/rubygem-dbm with Ruby 3.2"

This reverts commit 2a325f4cc52c8565348304a9a24a2975ecaaeedd.

With commit 5ebb18384791 database/ruby-bdb works fine with all
supported ruby versions. So always use it as RUN_DEPENDS again.

PR: 272491
Approved by: maintainer timeout