`test_xml_etree` case `test_deeply_nested_deepcopy` fails under PGO on macOS

[zanieb]

This is the same as #140125 but for test_xml_etree.

cpython-3.14> ======================================================================
cpython-3.14> FAIL: test_deeply_nested_deepcopy (test.test_xml_etree_c.BadElementTest.test_deeply_nested_deepcopy)
cpython-3.14> ----------------------------------------------------------------------
cpython-3.14> Traceback (most recent call last):
cpython-3.14>   File "/private/var/folders/1r/b8l6nzhj4zdbz5jmjdhqbprw0000gn/T/tmppy3sq3k2/Python-3.14.5rc1/Lib/test/test_xml_etree.py", line 3111, in test_deeply_nested_deepcopy
cpython-3.14>     with self.assertRaises(RecursionError):
cpython-3.14>          ~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^
cpython-3.14> AssertionError: RecursionError not raised
cpython-3.14> 
cpython-3.14> ----------------------------------------------------------------------

There's not much to say here, as I believe the previous discussion covers the topic adequately.

Linked PRs

• gh-149285: Increase recursion depth for test_xml_etree from 150k to 500k #149286
• [3.14] gh-149285: Increase recursion depth for test_xml_etree from 150k to 500k (GH-149286) #149287

[zanieb]

This is a new test case from

• gh-148801: Fix unbound C recursion in Element.__deepcopy__() #148802

[StanFromIreland]

I updated the 3.13 backport which has not landed yet.