Set the minimum TLS version for the FTP server and TLS services to

TLS 1.2.  For static services and JS sockets, add a new tls_minver
socket property which can be set to use a lower minver (down to the
wildly insecure TLS 1.0).

TLS 1.0 and 1.1 have been not reccomended since 2015, and deprecated
since 2021.