Nwz/Shutterstock Amid softening demand for new smartphones, China-based Android brand OnePlus has announced it is retrenching from the North American and European markets this year. That means no new phones, no new foldables, no new tablets, and no new earbuds coming to the United States and elsewhere from the storied rebel upstart of 2013. It'll be refocusing in Asia and India where it competes with other Chinese labels, including its own sister company Oppo. With this move, you might be wondering whether your OnePlus phone is still safe to use. After all, software updates are an important element in defending…