Bump phpseclib/phpseclib from 2.0.31 to 2.0.47 (#1217)

Bumps [phpseclib/phpseclib](https://github.com/phpseclib/phpseclib) from 2.0.31 to 2.0.47.
- [Release notes](https://github.com/phpseclib/phpseclib/releases)
- [Changelog](https://github.com/phpseclib/phpseclib/blob/master/CHANGELOG.md)
- [Commits](phpseclib/phpseclib@2.0.31...2.0.47)

---
updated-dependencies:
- dependency-name: phpseclib/phpseclib
  dependency-type: direct:production
...

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composer.json

@@ -39,7 +39,7 @@
         "spomky-labs/otphp": "^8.0",
         "drewm/mailchimp-api": "^2.4",
         "league/flysystem-sftp": "^1.0",
-        "phpseclib/phpseclib": "2.0.31",
+        "phpseclib/phpseclib": "2.0.47",
         "php-coveralls/php-coveralls": "^2.4",
         "endroid/qr-code": "^2.5",
         "oomphinc/composer-installers-extender": "^2.0",