3rdparty/intel-microcode: Update submodule to upstream main

Updating from commit id 129f82f7429c:
2024-10-29 17:43:50 -0600 - (microcode-20241029 Release)

to commit id 8ac9378a8487:
2024-11-12 11:14:21 -0600 - (microcode-20241112 Release)

This brings in 1 new commits:
8ac9378a8487 microcode-20241112 Release

Change-Id: Icdb00537c7e8733c8c81c834313e24b5c7842609
Signed-off-by: Felix Singer <[email protected]>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/85113
Tested-by: build bot (Jenkins) <[email protected]>
Reviewed-by: Elyes Haouas <[email protected]>

Author: felixsinger