sysutils/cpu-microcode-intel: Update to 2026-08-11 release

This update includes security fixes for INTEL-SA-01379, INTEL-SA-01404,
INTEL-SA-01423, INTEL-SA-01428, INTEL-SA-01435, INTEL-SA-01441,
INTEL-SA-01442, and INTEL-SA-01443, affecting various Core, Core Ultra,
and Xeon processors, as well as functional updates and support for new
steppings.

Release notes: https://github.com/intel/Intel-Linux-Processor-Microcode-Data-Files/releases/tag/microcode-20260811
Sponsored by: The FreeBSD Foundation