gh-92886: make test_coroutines pass with -O (assertions off) (GH-98060)

Automerge-Triggered-By: GH:iritkatriel

Lib/test/test_coroutines.py

@@ -1287,7 +1287,7 @@ async def __aexit__(self, *exc):
 
         async def func():
             async with CM():
-                assert (1, ) == 1
+                self.assertEqual((1, ), 1)
 
         with self.assertRaises(AssertionError):
             run_async(func())