Revert "WIP: coverity: Make sure curl is installed, as our coverity upload job needs it"

Revert 3038c19155, which adds a second
osmocom-coverity-deps job that apparently was never deployed (or was
deployed and then deleted). The mentioned curl dependency shouldn't go
here either.

Change-Id: I5d4709c0019ef4bae6ccbd11c28eeb23d75692c1

jobs/coverity.yml

@@ -2,18 +2,8 @@
 - project:
     name: osmocom-coverity
     jobs:
-      - osmocom-coverity-deps
       - osmocom-coverity
 
-- job:
-    name: 'osmocom-coverity-deps'
-    apt:
-      name: "{{ item }}"
-      cache_valid_time: 3600
-      update_cache: yes
-    with_items:
-      - curl
-
 - job:
     name: 'osmocom-coverity'
     project-type: freestyle