---
- name: Change user password
  hosts: "{{ target | default('all') }}"
  become: true
  vars:
    usuario: "{{ usuario }}"
    contrasena: "{{ contrasena }}"
  tasks:
    - name: Cambio de contrasena del usuario {{ usuario }}
      user:
        name: "{{ usuario }}"
        password: "{{  contrasena  | password_hash('sha512') }}"
        expires: -1
...