Until the build system makes new packages, you can take the https://github.com/armbian/build/blob/master/packages/blobs/meson/u-boot-nanopik2.bin
and stuff it into your current SD card.
Make sure your SD card is your SD card or you could wreck your host machine. <--- don't say I didn't warn you, some assembly required (seriously, don't overwrite your computer's boot sector)
# sudo dd if=fip/u-boot-nanopik2.bin of=/dev/<your SD Card> conv=fsync,notrunc bs=1 count=444
# sudo dd if=fip/u-boot-nanopik2.bin of=/dev/<your SD Card> conv=fsync,notrunc bs=512 skip=1 seek=1
# sync