Remove expired ports:
2020-11-30 www/rubygem-dashing: Unmaintained by upstream, use www/rubygem-smashing instead
2020-11-30 www/rubygem-redmine_acts_as_taggable_on: Unmaintained by upstream
2020-11-30 www/rubygem-gitlab-grack: Deprecated by upstream
2020-12-02 databases/db6: latest 6.2.x version and newer not downloadable without registration