On Ethereum mainnet, what was the Uniswap v4 spot price of pool 0x21c67e77068de97969ba93d4aab21826d33ca12bb9f565d8496e8fda8a82ca27 (ETH/USDC, currency0/currency1) as the median over 13 evenly spaced blocks of the window (blocks 26126740 to 26127038, about 4 hours before 26128234), as currency0 per 1e18 raw currency1 in raw units?