[SSHD-479] Upgrade used Maven artifacts versions to more recent versions
[SSHD-479] Upgrade used Maven artifacts versions to more recent versions

Upgraded versions:

    * Bouncycastle - 1.52 => 1.53
    * slf4j - 1.7.12 => 1.7.13
    * surefire - 2.18.1 => 2.19

lgoldstein/mina-sshd,lgoldstein/mina-sshd,apache/mina-sshd,lgoldstein/mina-sshd,lgoldstein/mina-sshd,apache/mina-sshd,apache/mina-sshd,apache/mina-sshd