libcanberra-pulse and libcanberra-gstreamer were deprecated in [Stable update] 2021-06-14
Manjaro sound not working after update
(Libcanberra - ArchWiki)
libcanberra no longer requires any backends for ALSA, pulseaudio or gstreamer, as they are now built in to the libcanberra package.
So libcanberra should work on either PulseAudio or PipeWire, or neither (ALSA)