What is the latest Bluetooth version having FOSS realizations?
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But in general there is very little support for 5.4 from the hardware side right now. I looked into ESLs (electronic shelf labels) which should be directly supported by 5.4 but you find almost nothing. Would just be nice if one could take any manufacturer's ESLs and they would just work. Right now there is a plethora of different standards.
I wont hold my breath for 6.2 support. There are not many devs on bluez and on the kernel side.
That said, even if a company which already launched its product would upgrade their stack to a newer version, it's unlikely that they would spend the money and resources to re-certify for a newer BT-version unless there's an explicit need for it. They rather treat this as a maintenance release of the existing certification...
So it might be that there are more devices with 5.4 BT-stack out there than it seems...