update migrate_source_csv

composer.json

@@ -25,7 +25,7 @@
     "drupal/features" : "^3.7",
     "drupal/migrate_plus" : "^5.1",
     "drupal/migrate_tools" : "^5.0",
-    "drupal/migrate_source_csv" : "^2.1",
+    "drupal/migrate_source_csv" : "^3.4",
     "drupal/token" : "^1.3",
     "drupal/flysystem" : "^2.0@alpha",
     "islandora/crayfish-commons": "dev-dev",