downgraded flag & flag_lists as flag_lists db upgrade failes

upgraded core to ^9.3

config/sync/mailgun.settings.yml

@@ -1,3 +1,7 @@
+_core:
+  default_config_hash: bMOl3jD7ZuzZMuaUYzyqadr56G486ldo28NYIkK_54g
+api_endpoint: 'https://api.mailgun.net'
+api_key: ''
 working_domain: materio.com
 debug_mode: false
 test_mode: false
@@ -8,7 +12,3 @@ format_filter: plain_text
 use_queue: true
 use_theme: false
 tagging_mailkey: true
-_core:
-  default_config_hash: bMOl3jD7ZuzZMuaUYzyqadr56G486ldo28NYIkK_54g
-api_endpoint: 'https://api.mailgun.net'
-api_key: ''