MAGETWO-89091: CE edition - Update composer dependencies

- update zendframework/zend-code to 3.1.0 and zendframework/zend-mail to 2.9.0

Author: Joan He

composer.json

@@ -57,7 +57,7 @@
         "tubalmartin/cssmin": "4.1.0",
         "webonyx/graphql-php": "^0.11.1",
         "zendframework/zend-captcha": "^2.7.1",
-        "zendframework/zend-code": "^3.1.0",
+        "zendframework/zend-code": "~3.1.0",
         "zendframework/zend-config": "^2.6.0",
         "zendframework/zend-console": "^2.6.0",
         "zendframework/zend-crypt": "^2.6.0",
@@ -69,7 +69,7 @@
         "zendframework/zend-i18n": "^2.7.3",
         "zendframework/zend-json": "^2.6.1",
         "zendframework/zend-log": "^2.9.1",
-        "zendframework/zend-mail": "^2.8.0",
+        "zendframework/zend-mail": "^2.9.0",
         "zendframework/zend-modulemanager": "^2.7",
         "zendframework/zend-mvc": "~2.6.3",
         "zendframework/zend-serializer": "^2.7.2",