Allow update of camptocamp/systemd

This patch relaxes the version dependency for camptocamp/systemd, so
that we can install version 2.x of it.

metadata.json

@@ -26,7 +26,7 @@
     },
     {
       "name": "camptocamp/systemd",
-      "version_requirement": ">= 0.4.0 < 2.0.0"
+      "version_requirement": ">= 0.4.0 < 3.0.0"
     }
   ],
   "operatingsystem_support": [