Support Python 3.12

[rzvoncek]

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A fresh Ubuntu 24.04 LTS now installs Python 3.12 by default.
At the moment, Medusa does not support this, there's some dependency issue. Also, pip installing off a branch won't work.

┆Issue is synchronized with this Jira Story by Unito
┆Issue Number: MED-10

[rzvoncek]

Had another go at this. The parallel-ssh, ssh-python and ssh2-python libraries are no longer maintaned. It might be possible to re-package them for Python 3.12 onwards, but then we'd need to maintain that.

A more feasible aproach seems to be to rewrite our parallel ssh code to use asyncssh instead.