Fix _PyTraceMalloc_Fini() definition (GH-16259)

The function return type is void, not int.

Author: vstinner

Include/internal/pycore_pylifecycle.h

@@ -84,7 +84,7 @@ extern void _PyUnicode_Fini(void);
 extern void _PyLong_Fini(void);
 extern void _PyFaulthandler_Fini(void);
 extern void _PyHash_Fini(void);
-extern int _PyTraceMalloc_Fini(void);
+extern void _PyTraceMalloc_Fini(void);
 extern void _PyWarnings_Fini(PyInterpreterState *interp);
 
 extern void _PyGILState_Init(