I noticed that too. Updates seem to come in batches. At times, there are updates almost every day and at other times there is nothing for weeks. Some of the inactivity could probably be explained by holidays, so I just try to be patient and wait for the next batch. A more optimistic interpretation could be that the team is putting most of its efforts into the upcoming Crimson release?
byzantium-updates-proposed got a new kernel (6.6.0-1-librem5) late last week, so some updates are coming. I haven’t seen much else get updated recently aside from a few small libs.