Update dependency league/flysystem to v1.1.4 [SECURITY]

Author: renovate[bot]

composer.json

@@ -4,7 +4,7 @@
     "license": "GPL-3.0",
     "require": {
         "phpunit/phpunit": "8.4.3",
-        "league/flysystem": "1.0.57"
+        "league/flysystem": "1.1.4"
     },
     "autoload": {
         "psr-4": {