During emerge -vuNDa world:

sys-firmware/intel-microcode:0  selected: (sys-firmware/intel-microcode-20210608_p20210830:0/0::core-hw-kit, installed)
  skipped: (sys-firmware/intel-microcode-20220207_p20220207:0/0::core-hw-kit, ebuild scheduled for merge) (see unsatisfied dependency below)emerge: there are no ebuilds to satisfy "sys-apps/iucode_tool".
(dependency required by "sys-firmware/intel-microcode-20220207_p20220207::core-hw-kit" [ebuild])