python: Normalize quotes with Black.

Signed-off-by: Anders Kaseorg <anders@zulip.com>

zerver/management/commands/delete_old_unclaimed_attachments.py

@@ -14,23 +14,23 @@ class Command(BaseCommand):
 
     def add_arguments(self, parser: ArgumentParser) -> None:
         parser.add_argument(
-            '-w',
-            '--weeks',
-            dest='delta_weeks',
+            "-w",
+            "--weeks",
+            dest="delta_weeks",
             default=5,
             type=int,
             help="Limiting value of how old the file can be.",
         )
 
         parser.add_argument(
-            '-f',
-            '--for-real',
-            action='store_true',
+            "-f",
+            "--for-real",
+            action="store_true",
             help="Actually remove the files from the storage.",
         )
 
     def handle(self, *args: Any, **options: Any) -> None:
-        delta_weeks = options['delta_weeks']
+        delta_weeks = options["delta_weeks"]
         print(f"Deleting unclaimed attached files older than {delta_weeks} weeks")
 
         # print the list of files that are going to be removed