mark CVE-2018-7667 as fixed with 4.5.0-1

The 4.4.0 upstream version adds two mitigations steps for the issue,
which maybe could be better solved by restricting access to server
instances configured via a configuration file on adminer's side? (like
phpmyadmin approach).

But so far there probably not much more upstream can do, and admins af
an adminer instance could additionaly restrict access to the adminer
instance via upfront authentication.