Fix GH-11347: Memory leak when calling a static method inside an xpath query

It's a type confusion bug. `zend_make_callable` may change the function name
of the fci to become an array, c

Fix GH-11347: Memory leak when calling a static method inside an xpath query

It's a type confusion bug. `zend_make_callable` may change the function name
of the fci to become an array, causing a crash in debug mode on
`zval_ptr_dtor_str(&fci.function_name);` in `dom_xpath_ext_function_php`.
On a production build it doesn't crash but only causes a leak, because
the array elements are not destroyed, only the array container itself
is. We can use the nogc variant because it cannot contain cycles, the
potential array can only contain 2 strings.

Closes GH-11350.

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