Update OS2forms to version 3

Author: Mads Nørgaard

composer.json

@@ -18,7 +18,7 @@
     "require": {
         "drupal/gin": "^3.0",
         "drupal/core": "^8 || ^9",
-        "os2forms/os2forms": "^2.8",
+        "os2forms/os2forms": "^3.0",
         "os2forms/os2forms_forloeb": "^1.9",
         "os2web/os2web_simplesaml": "8.x-dev"
     },