build: close ssh_channel upon timeout

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The build can get stuck when running into the timeout and paramiko not
noticing it. This can be reproduced by setting a small build timeout for
an app. I tried setting set_keepalive() but it did not help. This
forcefully closes the ssh channel to the VM so the fdroid build will
continue. As we destroy the VM in the next step anyhow I think this is
fine.

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