---
- name: 'all'
  hosts: 'all'
  gather_facts: false
  serial: 1
  tasks:
    - name: 'Remove known_host file entries'
      delegate_to: 'localhost'
      ansible.builtin.shell:
        ssh-keygen -f ~/.ssh/known_hosts -R {{ inventory_hostname }}
    - name: 'Add known_hosts file entries'
      delegate_to: 'localhost'
      ansible.builtin.shell:
        ssh-keyscan {{ inventory_hostname }} >> ~/.ssh/known_hosts
...