* Use new config to disable OhMyZsh auto update

There's a new method:
https://github.com/ohmyzsh/ohmyzsh/wiki/Settings#deprecated-settings

* bump patch version

* Remove `buster` from testing scenarios as it is EOL

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Co-authored-by: Álvaro Rausell Guiard <33221237+AlvaroRausell@users.noreply.github.com>