Upgrade requirements

as https://github.com/YunoHost/yunohost/commit/f0590907c9e2eebe46d28146698387a33a8aea76 will be in 4.3.1.1

manifest.json

@@ -21,7 +21,7 @@
         "url": "http://www.librement-votre.fr"
     },
     "requirements": {
-        "yunohost": ">= 4.1.3"
+        "yunohost": ">= 4.3.1.1"
     },
     "multi_instance": false,
     "services": [