* Drop support for ansible-core 2.11 and 2.12.
Also move ansible-core 2.13 from regular CI to EOL CI.
* Remove some compatibility code.
* Remove no longer needed import.
* Update README.
Co-authored-by: Alexei Znamensky <103110+russoz@users.noreply.github.com>
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Co-authored-by: Alexei Znamensky <103110+russoz@users.noreply.github.com>