Missing `@nomemtest` decorator on `test_error_path_no_crash` test in `test_pyexpat.py`

[sobolevn]

I probably missed it while doing #152236
PR is on its way.

Linked PRs

• gh-152402: Use support.nomemtest in test_pyexpat #152403
• [3.15] gh-152402: Use support.nomemtest in test_pyexpat (GH-152403) #152411
• [3.14] gh-152402: Use support.nomemtest in test_pyexpat (GH-152403) #152412
• [3.13] gh-152402: Use support.nomemtest in test_pyexpat (GH-152403) #152413