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Why do you think this is happening? I just updated a bunch of client sites and they all show me running 6.6.1, but this particular site says simply "42" for the version. I've reinstalled the core files and updated everything and this persists.
r/hitchhikersguidetothegalaxy ? Or maybe you have a theme, plugin or code snippet that alters the footer message? You can also search for a filter that uses the admin_footer_text hook.