security/php-ssh2: update to 1.3.1

1.3 (2021-03-01)

* Add ssh2_send_eof() [PR #45] (Calvin Buckley)
* PHP stream cast function for SSH channel objects for stream_select()
  support. [PR #38] (Robert Wolf)
* Fix for PHP 7.4 and 8 [PR #44] (Andy Postnikov and Remi Collet)
* Fixed debug and disconnected callback [PR #37] (Piotr Rogowski)
* Various stability and memory issue fixes [PR #39, #41] (Robert Wolf)
* Segfault fix for bug #79757 [PR #43] (Konrad K)
* Various stability and bug fixes #79631, #63480, #80294, #75523, #80729 [PR
  #46, #47, #48, #49, #50 and #51] (Christoph M. Becker)

1.3.1 (2021-03-02)

* 1.3.1 release only fixed the PHP >= 8.0 requirement in the package.xml. No
  code changes.

(taca)