security/ruby-net-ssh: update to 7.0.1

pkgsrc change: make CATEGORIES to security.

There are changes entries before 7.0.0.  Please refer
<https://github.com/net-ssh/net-ssh/compare/v6.1.0...v7.0.1> for 7.0.0 and
later changes.

6.3.0 beta1

  * Support cert based host key auth, fix asterisk in known_hosts [#833]
  * Support kex dh-group14-sha256  [#795]
  * Fix StrictHostKeyChecking ssh config parameter translation [#765]

6.2.0 rc1

6.2.0 beta1

  * rsa-sha2-512, rsa-sha2-256 host_key algs [#771]
  * JRuby aes*-ctr suppport [#767]

(taca)