By Pushkala Aripaka (Reuters) – Aston Martin blamed global supply chain problems for pushing back an expected improvement in its finances, as the luxury carmaker cut its 2022 deliveries and margin forecasts. Shares in the British company fell more than 12% in early Wednesday trade after it said cash inflows were only likely towards the end of the fourth quarter and into early 2023. In July, it had forecast an improvement in its finances in the second half of the year, predicting positive free cash flow after burning through tens of millions of pounds in cash. Carmakers globally have faced prob…