sysutils/cpu-microcode-intel: Update to 2026-08-12 release

Roll back Meteor Lake (06-aa-04, stepping C0) microcode update to what
was included before the 2026-08-11 release due to functional issues.

Release notes: https://github.com/intel/Intel-Linux-Processor-Microcode-Data-Files/releases/tag/microcode-20260812
Sponsored by: The FreeBSD Foundation