gh-97616: test_list_resize_overflow() uses sys.maxsize

[vstinner]

• Issue: [security] list_resize(): integer overflow if newsize is too large #97616

[vstinner]

cc @mattip

[mattip]

Thanks, this makes the code compatible with PyPy which does not have a tuple.__itemsize__

[vstinner]

I removed the fix to test manually that the modified test still triggers the crash:

test_list_resize_overflow (test.test_list.ListTest.test_list_resize_overflow) ... Fatal Python error: Segmentation fault

Current thread 0x00007f9d3fe11740 (most recent call first):
  File "/home/vstinner/python/main/Lib/test/test_list.py", line 110 in test_list_resize_overflow

Yep, it does still crash :-)