Run `pyupgrade --py37-plus --keep-percent-format` on Synapse (#11685)

* newsfragment

* fix newsfragment number

* update changelog

* remove extra space

changelog.d/11685.misc

@@ -0,0 +1 @@
+Run `pyupgrade --py37-plus --keep-percent-format` on Synapse.

synapse/rest/admin/media.py

@@ -466,7 +466,7 @@ class UserMediaRestServlet(RestServlet):
         )
 
         deleted_media, total = await self.media_repository.delete_local_media_ids(
-            ([row["media_id"] for row in media])
+            [row["media_id"] for row in media]
         )
 
         return HTTPStatus.OK, {"deleted_media": deleted_media, "total": total}

synapse/storage/databases/main/session.py

@@ -1,4 +1,3 @@
-# -*- coding: utf-8 -*-
 #  Copyright 2021 The Matrix.org Foundation C.I.C.
 #
 #  Licensed under the Apache License, Version 2.0 (the "License");