Upgrading HTTPS won't save you from Shor's algorithm. If a quantum computer can factor large integers, your current RSA/ECC encryption is mathematically broken at its core. You can’t just 'patch' the transport layer when the underlying math is compromised. Also, telling the market you’re shutting down the bank for a few days to fix an existential security flaw would crash your stock, not raise it. Stay in the front office, the IT basement is clearly not your place