[3.11] gh-96821: Fix undefined behaviour in _testcapimodule.c
(GH-96915)
#96927
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#96821: Assert for demonstrating undefined behaviourFix UB
Co-authored-by: C.A.M. Gerlach [email protected]
(cherry picked from commit cbdeda8)
Co-authored-by: Matthias Görgens [email protected]