Fixed test failure on Python 3.12.3

It seems that the recursion limit was upgraded in 3.12.3.

tests/test_exceptions.py

@@ -373,7 +373,7 @@ def test_basics_split_by_predicate__match(self):
 class DeepRecursionInSplitAndSubgroup(unittest.TestCase):
     def make_deep_eg(self):
         e = TypeError(1)
-        for _ in range(2000):
+        for _ in range(10000):
             e = ExceptionGroup("eg", [e])
         return e