include config migration for node_storage deprecation

nucypher/config/migrations/configuration_v8_to_v9.py

@@ -0,0 +1,15 @@
+from typing import Dict
+
+from nucypher.config.migrations.common import perform_migration
+
+
+def __migration(config: Dict) -> Dict:
+    # deprecations
+    del config["node_storage"]
+    return config
+
+
+def configuration_v8_to_v9(filepath) -> None:
+    perform_migration(
+        old_version=8, new_version=9, migration=__migration, filepath=filepath
+    )