Fix winrm vs ssh typo in error message
The error message referred to "winrm tunnel", despite this being the SSH connector. This was probably just a copy-paste mistake.
Discovered because I saw Preparation failed: error during connect: Get "http://internal.tunnel.invalid/v1.24/info": winrm tunnel: Process exited with status 127
errors being logged when trying to connect via our Hetzner plugin, despite the plugin not having any winrm support (Hetzner is a mostly-Linux cloud provider at the moment). It turned out the problem wasn't in our own code in this case.