Merge branch '3462732-test' into '2.x'

Draft: DO NOT MERGE - Modify Migrate Plus version constraint - test.

See merge request !12

composer.json

@@ -18,7 +18,7 @@
     },
     "require": {  },
     "require-dev": {
-        "drupal/migrate_plus": ">=5.0 <6.0.3",
+        "drupal/migrate_plus": "6.0.x-dev",
         "drupal/pathauto": "^1",
         "drush/drush": "^10.4.0 || ^11 || ^12 || ^13@beta"
     },