Update to libssh 0.9.5

[enkore]

libssh 0.9.x up to 0.9.5 contains a bug where ssh_channel_read() will sometimes incorrectly return SSH_ERROR. This happens a lot when executing short-lived programs that produce no or little output.

• libssh bug: https://bugs.libssh.org/T231
• libssh change: https://gitlab.com/libssh/libssh-mirror/-/commit/750e4f3f9d3ec879929801d65a500ec3ad84ff67

(eref 42d478fb6976)

[pkittenis]

Thanks for the interest and report. That is a pretty easy change if anyone would like to make a PR.