Cheapest Spreadtrum (now Unisoc) you can buy is SC7731E, which has at the very least Android 7, and is slated to get Android 13 BSP.

Most current cheap rockchips are rk3328/rk3228, who got at least Android 8, even more recent (I think 3328 got Android 12). Last Allwinner board, H616, I got was running Android 9, but it was few years ago so it was pretty recent, and it's considered an obsolete SoC on several accounts. I don't really know what Amlogic sells nowadays

Granted, I only buy devices for which the the Android devices is displayed, because well I want GSI to run on it, but I haven't seen a device sold as Android 4.* for years. I ordered an iPhone knock-off that might prove me wrong... (it says Android 11 on the spec sheet)