Merge branch 'update_ca_debian' into 'master'

update gnutls-bin Debian-based OS (to fix the issue with Let's Encrypt CA)

See merge request automation/pg-tests!1355

Author: Alexander Lakhin

tests_install/playbook-prepare-env.yml

@@ -363,6 +363,7 @@
         - gcc
         - gdb
         - sudo
+        - gnutls-bin
       state: present
       update_cache: yes
     when: ansible_distribution == 'Debian' or ansible_distribution == 'Ubuntu' or