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prevent overflow in ares_array allocation size calculations (#1117)

fix: prevent overflow in ares_array allocation size calculations

Validate rounded capacity and allocation size in ares_array_set_size
to avoid integer overflow leading to undersized allocations.

Add checks for power-of-two rounding overflow and ensure that
size * member_size stays within size_t limits before allocation.

Signed-off-by: @uwezkhan

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