Ensure DBBACKUP_STORAGE_OPTIONS is a dict (#8153) (#8154)

(cherry picked from commit 0cd493e)

Co-authored-by: Oliver <oliver.henry.walters@gmail.com>

Author: github-actions[bot]

src/backend/InvenTree/InvenTree/settings.py

@@ -170,10 +170,11 @@
 
 # Default backup configuration
 DBBACKUP_STORAGE_OPTIONS = get_setting(
-    'INVENTREE_BACKUP_OPTIONS', 'backup_options', None
+    'INVENTREE_BACKUP_OPTIONS',
+    'backup_options',
+    default_value={'location': config.get_backup_dir()},
+    typecast=dict,
 )
-if DBBACKUP_STORAGE_OPTIONS is None:
-    DBBACKUP_STORAGE_OPTIONS = {'location': config.get_backup_dir()}
 
 INVENTREE_ADMIN_ENABLED = get_boolean_setting(
     'INVENTREE_ADMIN_ENABLED', config_key='admin_enabled', default_value=True