Fix comments referencing v1.46.0 from PR #10969. (#11212)

#10969 was merged after 1.46.0rc1 was cut and will be included
in v1.47.0rc1 instead.

changelog.d/11212.bugfix

+Fix a long-standing bug where messages in the `device_inbox` table for deleted devices would persist indefinitely. Contributed by @dklimpel and @JohannesKleine.
\ No newline at end of file

synapse/storage/databases/main/deviceinbox.py

@@ -594,7 +594,7 @@ class DeviceInboxBackgroundUpdateStore(SQLBaseStore):
     ) -> int:
         """A background update that deletes all device_inboxes for deleted devices.
 
-        This should only need to be run once (when users upgrade to v1.46.0)
+        This should only need to be run once (when users upgrade to v1.47.0)
 
         Args:
             progress: JsonDict used to store progress of this background update

synapse/storage/schema/main/delta/64/02remove_deleted_devices_from_device_inbox.sql

@@ -15,7 +15,7 @@
 
 
 -- Remove messages from the device_inbox table which were orphaned
--- when a device was deleted using Synapse earlier than 1.46.0.
+-- when a device was deleted using Synapse earlier than 1.47.0.
 -- This runs as background task, but may take a bit to finish.
 
 INSERT INTO background_updates (ordering, update_name, progress_json) VALUES