Use type hinting generics in standard collections (#19046)

aka PEP 585, added in Python 3.9

 - https://peps.python.org/pep-0585/
 - https://docs.astral.sh/ruff/rules/non-pep585-annotation/

tests/server_notices/test_resource_limits_server_notices.py

@@ -17,7 +17,6 @@
 # [This file includes modifications made by New Vector Limited]
 #
 #
-from typing import Tuple
 from unittest.mock import AsyncMock, Mock
 
 from twisted.internet.testing import MemoryReactor
@@ -363,7 +362,7 @@ class TestResourceLimitsServerNoticesWithRealRooms(unittest.HomeserverTestCase):
 
         self.assertTrue(notice_in_room, "No server notice in room")
 
-    def _trigger_notice_and_join(self) -> Tuple[str, str, str]:
+    def _trigger_notice_and_join(self) -> tuple[str, str, str]:
         """Creates enough active users to hit the MAU limit and trigger a system notice
         about it, then joins the system notices room with one of the users created.