fix: update phpseclib minimum version

Author: bshaffer

composer.json

@@ -11,7 +11,7 @@
         "google/apiclient-services": "~0.350",
         "firebase/php-jwt": "^6.0||^7.0",
         "monolog/monolog": "^2.9||^3.0",
-        "phpseclib/phpseclib": "^3.0.36",
+        "phpseclib/phpseclib": "^3.0.50",
         "guzzlehttp/guzzle": "^7.4.5",
         "guzzlehttp/psr7": "^2.6"
     },