FATAL: remaining connection slots are reserved for non-replication superuser connections

Job #170141626 failed for b37e1217:

       # ------------------
       # --- Caused by: ---
       # NoMethodError:
       #   undefined method `email_header_and_footer_enabled=' for #<Appearance:0x0000563d3a9eb3f8>
       #   ./lib/gitlab/favicon.rb:52:in `appearance'