* tasks/main.yml: prefix all builtin modules with ansible.builtin
(file, template) — silences ansible-lint fqcn[action-core] and
matches the convention used by the other roles in this collection.
* meta/main.yml: change min_ansible_version from the float 2.14 to
the string '2.14'. ansible-galaxy's schema requires a string here
(ansible-lint schema[meta] complains otherwise — same fix I just
applied to the opnform role).