Syntax fix in bootstrap playbook

[Zorlin]

TASK [Ansible - install key packages] *************************************************************************************
[DEPRECATION WARNING]: Invoking "apt" only once while using a loop via squash_actions is deprecated. Instead of using a
loop to supply multiple items and specifying name: "{{ item }}", please use name: ['ansible', 'python-apt', 'git'] and
remove the loop. This feature will be removed in version 2.11. Deprecation warnings can be disabled by setting
deprecation_warnings=False in ansible.cfg.