It appears to have worked:
sudo pacman -R pipewire-pulse
checking dependencies...
:: pipewire optionally requires pipewire-pulse: PulseAudio support
Packages (1) pipewire-pulse-0.3.15-2
Total Removed Size: 0,53 MiB
:: Do you want to remove these packages? [Y/n]
:: Processing package changes...
(1/1) removing pipewire-pulse [#######################################################################################] 100%
:: Running post-transaction hooks...
Latest update log (it appears to have passed looking for conflicting packages...):
sudo pacman -Syyuu
:: Synchronising package databases...
:: Starting full system upgrade...
:: Replace cldr-emoji-annotation with community/unicode-cldr? [Y/n] y
:: Replace linux57-headers with community/linux-latest-headers? [Y/n]
:: Replace linux58-headers with community/linux-latest-headers? [Y/n]
:: Replace mhwd-nvidia-418xx with core/mhwd-nvidia? [Y/n]
:: Replace mhwd-nvidia-430xx with core/mhwd-nvidia? [Y/n]
:: Replace mhwd-nvidia-435xx with core/mhwd-nvidia? [Y/n]
:: Replace mhwd-nvidia-450xx with core/mhwd-nvidia? [Y/n]
:: Replace mhwd-nvidia-455xx with core/mhwd-nvidia? [Y/n]
:: Replace qtkeychain with community/qtkeychain-qt5? [Y/n]
:: Replace xorg-server-xwayland with extra/xorg-xwayland? [Y/n]
resolving dependencies...
looking for conflicting packages...
warning: dependency cycle detected:
warning: bashrc-manjaro will be installed before its bash dependency