[DRE-maint] Bug#909661: Bug#909661: unicorn won't start: "Could not find rbpdf-font-1.19.0"

[Hashem Nasarat]

I can see in the Gemfile.lock that rbpdf is still 1.19.0 where it should be
1.19.5
As a temporary workaround you should be able to run the following command
to refresh your Gemfile.lock:

sudo /var/lib/dpkg/info/redmine.postinst "triggered"

Upon discussion with redmine maintainers in #debian-ruby, this is a bug in
the redmine triggers file:

> <terceiro> hashem: redmine should be triggered when any ruby package gets
installed, to update the Gemfile.lock
> <terceiro> hashem: relevant files in the redmine source tree:
debian/redmine.triggers and debian/postinst
> <terceiro> hashem: I now realize that debian/redmine.triggers is missing
a line containing `/usr/share/rubygems-integration`
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