tests: ensure ca-certificates is up to date

otherwise the `rpm_key` module fails because it can't verify the
certificate.

Signed-off-by: Guillaume Abrioux <gabrioux@redhat.com>

tests/functional/setup.yml

@@ -4,6 +4,7 @@
   become: yes
   tasks:
 
+
     - name: check if it is Atomic host
       stat: path=/run/ostree-booted
       register: stat_ostree
@@ -23,6 +24,14 @@
       until: result is succeeded
       when: not is_atomic | bool
 
+    - name: ensure ca-certificate is latest version
+      package:
+        name: ca-certificates
+        state: latest
+      register: result
+      until: result is succeeded
+      when: not is_atomic | bool
+
     - name: centos based systems - configure repos
       block:
         - name: disable fastest mirror detection