Since the latest update to openssh, ssh-keygen's output format for key
fingerprints has changed.  The default hash algorithm is now base64-encoded
SHA256 instead of MD5, and the hash name precedes its value, like

    SHA256:lvRrjAXmEhzDp5kQqzelsei8s5hXJ+zLaqJ2yiGXmYc

This breaks the current logic for detecting key fingerprints in cygport's
lib/pkg_upload.cygpart.  The attached patch fixes the problem.  (You might know
a more precise regex for the base64-encoded hash value than I do.  I couldn't
find any documentation of it anywhere, and just settled for

    SHA256:.{44}

)

Andrew