Add incompatibility blurb for OpenSSH scp >= release 8.8 (!343) · Merge requests · Holland Computing Center / HCC docs

scp defaults to SFTP over SCP protocol by default with these releases.
The origin/reason for the changes started here: https://www.cve.org/CVERecord?id=CVE-2019-6111
And a good discussion of what changed: https://unix.stackexchange.com/questions/571293/is-scp-unsafe-should-it-be-replaced-with-sftp/571549#571549
Incompatibility came to light with the following tickets where the requesters did a recent OS upgrade: https://help.hcc.unl.edu/a/tickets/34925 https://help.hcc.unl.edu/a/tickets/34956

Add incompatibility blurb for OpenSSH scp >= release 8.8