build(deps): bump phpseclib/phpseclib from 2.0.48 to 2.0.51

Bumps [phpseclib/phpseclib](https://github.com/phpseclib/phpseclib) from 2.0.48 to 2.0.51.
- [Release notes](https://github.com/phpseclib/phpseclib/releases)
- [Changelog](https://github.com/phpseclib/phpseclib/blob/master/CHANGELOG.md)
- [Commits](phpseclib/phpseclib@2.0.48...2.0.51)

---
updated-dependencies:
- dependency-name: phpseclib/phpseclib
  dependency-version: 2.0.51
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

composer.json

@@ -40,7 +40,7 @@
 		"pear/pear-core-minimal": "^1.10",
 		"php-http/guzzle7-adapter": "^1.0.0",
 		"php-opencloud/openstack": "^3.1",
-		"phpseclib/phpseclib": "^2.0.48",
+		"phpseclib/phpseclib": "^2.0.51",
 		"pimple/pimple": "^3.5.0",
 		"psr/clock": "^1.0",
 		"psr/container": "^2.0.2",