It's an easy fold.
If the table folds to you and wanted to move in with A5 - that is one thing.
But calling a shove that would cripple you if you lose and probably not cash in the tournament? …..Easy fold.
He should have a bigger A - a pair - or at least QJ KQ suited. There is not a good reason to gamble with A5 near the bubble.
Even if you win the hand, you can find a better spot to double up.
Good luck !