[coreboot-gerrit] Change in coreboot[master]: payloads: Update GRUB stable from 2.02 to 2.04

[Idwer Vollering (Code Review)]

Idwer Vollering has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/34104 )

Change subject: payloads: Update GRUB stable from 2.02 to 2.04
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Patch Set 4:
> Patch Set 3: Code-Review+2
>
> A hunch tells me that I will regret the addition of more
> scripting magic, but this has been sitting around for
> too long.

There's https://review.coreboot.org/c/coreboot/+/34105