Apple iPhone demand in China is continuing to accelerate while outpacing the broader and rebounding smartphone industry in the country, according to JP Morgan. iPhone 13s In a note to investors seen by AppleInsider, JP Morgan analyst Samik Chatterjee analyzes the latest smartphone sales data released from the China Academy of Information and Communications Technology (CAICT). The newest batch of data represents the month of June. The data shows that international smartphone shipments, which are mostly comprised of Apple devices, reached 3.5 million units in June. That's a jump from the monthly historical average of 2.3 million units. Although shipments…