MTS-1836: Upgrade csharpru/vault-php to 4.1+

Author: rganin

composer.json

@@ -22,7 +22,7 @@
         "codeception/module-sequence": "^1.0",
         "codeception/module-webdriver": "^1.0",
         "composer/composer": "^1.9",
-        "csharpru/vault-php": "~3.5.3",
+        "csharpru/vault-php": "^4.1.0",
         "csharpru/vault-php-guzzle6-transport": "^2.0",
         "hoa/console": "~3.0",
         "monolog/monolog": "^1.17",