[issue45878] Use `self.assertRaises` instead of `try/except` in `ctypes/test_functions.py::test_mro`

[Nikita Sobolev]

Change by Nikita Sobolev <mail at sobolevn.me>:


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keywords: +patch
pull_requests: +27957
stage:  -> patch review
pull_request: https://github.com/python/cpython/pull/29721

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<https://bugs.python.org/issue45878>
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