Add missing postgresql-devel dependency on Fedora

Gautier Prequested to merge
bagage/gitlab-development-kit:bagage-master-patch-83122 into master

What does this Merge Request do?

While trying to use GDK on Fedora (where bootstrap is not available), I had to fight a bit with ruby system libraries (ended up by removing it globally and using rvm instead) and missing this dependency.

Merge Request checklist

  • Tests added for new functionality. If not, please raise Issue to follow-up.
  • This change is backward compatible. If not, please include steps to communicate to our users.
  • Documentation added/updated, if needed.
  • gdk doctor test added, if needed.

This is part of Q4 2020 Hackaton

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