Alpine 3.18 renamed the packages raspberrypi and raspberrypi-libs to
raspberrypi-userland and raspberrypi-userland-libs respectively. Follow
that rename. With this moderniziation raspistill and friends now gets
deployed to /usr/bin, which makes any symlinks obsolete.
Note that there is and was never a 64-bit variant of raspistill. So
these symlinks were essentially useless all along.
This effectively doesn't change anything for users: Alpine automatically
installed the renamed package already and Home Assistant Core picked
up the raspistill binary from /usr/bin already.
