fix type casting warning

[StrikerRUS]

LightGBM/swig/StringArray.hpp

Lines 28 to 33 in 2903ca0

	StringArray(size_t num_elements, size_t string_size)
	: _string_size(string_size),
	_array(num_elements + 1, nullptr)
	{
	_allocate_strings(num_elements, string_size);
	}

[github-actions]

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