The fall season is when Apple releases major upgrades to its operating systems. The new features are what most people think of in regard to when they’ll install the upgrade, but perhaps it’s time to make security a higher priority during that consideration. That’s because those major OS upgrades are what Apple prioritizes when implementing security patches. In a support document Apple posted on Monday (via Ars Technica), Apple states that only the most current version of an OS has the most current security patches. “Because of dependency on architecture and system changes to any current versio…