Update tests

src/greenlet/tests/test_greenlet.py

@@ -471,7 +471,9 @@ def creator():
         # Unfortunately, this doesn't actually clear the references, they're in the
         # fast local array.
         if not wait_for_cleanup:
-            result[0].gr_frame.f_locals.clear()
+            # f_locals has no clear method in Python 3.13
+            if hasattr(result[0].gr_frame.f_locals, 'clear'):
+                result[0].gr_frame.f_locals.clear()
         else:
             self.assertIsNone(result[0].gr_frame)
 

src/greenlet/tests/test_greenlet_trash.py

@@ -29,8 +29,17 @@
 
 import unittest
 
+try:
+    from greenlet._greenlet import get_tstate_trash_delete_nesting
+except ImportError:
+    get_tstate_trash_delete_nesting = None
+
+
 class TestTrashCanReEnter(unittest.TestCase):
 
+    # Python 3.13 has not "trash delete nesting" anymore (but "delete later")
+    @unittest.skipIf(get_tstate_trash_delete_nesting is None,
+                     'need get_tstate_trash_delete_nesting()')
     def test_it(self):
         # Try several times to trigger it, because it isn't 100%
         # reliable.