d9 requires update to flysystem module

composer.json

@@ -27,7 +27,7 @@
     "drupal/migrate_tools" : "^5.0",
     "drupal/migrate_source_csv" : "^2.1",
     "drupal/token" : "^1.3",
-    "drupal/flysystem" : "^1.0",
+    "drupal/flysystem" : "^2.0@alpha",
     "islandora/crayfish-commons": "dev-dev",
     "drupal/hook_post_action" : "^1.0",
     "drupal/file_replace": "^1.1"