- fully absorb the libuavcan submodule (renamed libdronecan to deconflict) up to our last good working commit and preserve all history (upstream libuavcan was broken and then marked deprecated)
- fixes https://github.com/PX4/PX4-Autopilot/issues/23727
- this puts us in a much better position to be able to evolve the library going forward ow that we have full control in tree