Fix pytest.warns(None) usage, deprecated in pytest 7 (#6664)

* remove pytest.warns(None)

Deprecated misuse of pytest.warns()

https://docs.pytest.org/en/latest/deprecations.html#using-pytest-warns-none

* Remove duplicate test

test_session_close_awaitable() does the exact same thing and should throw a deprecation warning already which is caught by the general filter

* PR 6664 metadata

* "Fix" spelling. Bots everywhere!

* Update 6663.bugfix

* Update 6663.bugfix

Co-authored-by: Sam Bull <aa6bs0@sambull.org>

CHANGES/6663.bugfix

@@ -0,0 +1 @@
+Remove a deprecated usage of pytest.warns(None)

CONTRIBUTORS.txt

@@ -52,6 +52,7 @@ Artem Yushkovskiy
 Arthur Darcet
 Austin Scola
 Ben Bader
+Ben Greiner
 Ben Timby
 Benedikt Reinartz
 Bob Haddleton

tests/test_client_functional.py

@@ -2444,32 +2444,19 @@ async def close(self):
 
 
 async def test_async_with_session() -> None:
-    with pytest.warns(None) as cm:
-        async with aiohttp.ClientSession() as session:
-            pass
-    assert len(cm.list) == 0
+    async with aiohttp.ClientSession() as session:
+        pass
 
     assert session.closed
 
 
 async def test_session_close_awaitable() -> None:
     session = aiohttp.ClientSession()
-    with pytest.warns(None) as cm:
-        await session.close()
-    assert len(cm.list) == 0
+    await session.close()
 
     assert session.closed
 
 
-async def test_close_run_until_complete_not_deprecated() -> None:
-    session = aiohttp.ClientSession()
-
-    with pytest.warns(None) as cm:
-        await session.close()
-
-    assert len(cm.list) == 0
-
-
 async def test_close_resp_on_error_async_with_session(aiohttp_server: Any) -> None:
     async def handler(request):
         resp = web.StreamResponse(headers={"content-length": "100"})