Install aiohttp 3.9.0b0 on Python 3.12

This partially reverts commit 247fb17.

setup.py

@@ -28,6 +28,8 @@
     # pycodestyle is a dependency of flake8, but it must be frozen because
     # their combination breaks too often
     # (example breakage: https://gitlab.com/pycqa/flake8/issues/427)
+    'aiohttp>=3.8.1; python_version < "3.12"',
+    'aiohttp==3.9.0b0; python_version >= "3.12"',
     'flake8~=5.0',
     'psutil',
     'pycodestyle~=2.9.0',
@@ -36,15 +38,6 @@
     CYTHON_DEPENDENCY,
 ]
 
-if vi < (3, 12):
-    # XXX Revert this change later.
-    #
-    # Python 3.12 is new and there's no aiohttp wheel for it yet.
-    # And pip helfully fails on building a wheel for it and I've
-    # no idea how to disable that.
-    TEST_DEPENDENCIES += ['aiohttp>=3.8.1']
-
-
 # Dependencies required to build documentation.
 DOC_DEPENDENCIES = [
     'Sphinx~=4.1.2',

tests/test_aiohttp.py

@@ -7,6 +7,7 @@
     skip_tests = False
 
 import asyncio
+import sys
 import unittest
 import weakref
 
@@ -48,6 +49,14 @@ async def test():
         self.loop.run_until_complete(runner.cleanup())
 
     def test_aiohttp_graceful_shutdown(self):
+        if self.implementation == 'asyncio' and sys.version_info >= (3, 12, 0):
+            # In Python 3.12.0, asyncio.Server.wait_closed() waits for all
+            # existing connections to complete, before aiohttp sends
+            # on_shutdown signals.
+            # https://github.com/aio-libs/aiohttp/issues/7675#issuecomment-1752143748
+            # https://github.com/python/cpython/pull/98582
+            raise unittest.SkipTest('bug in aiohttp: #7675')
+
         async def websocket_handler(request):
             ws = aiohttp.web.WebSocketResponse()
             await ws.prepare(request)