Fixes #36650 - change the OS default hash function

[ares]

The default hash function should be more secure SHA512. NSA has recommended SHA512 since RHEL 5, so it's likely widely adopted. SHA256 is no longer considered supported and is prohibitted by some policies.

This is a cherry-pick from develop, as it was suggested at https://github.com/theforeman/foreman/pull/10206