bug#47185: grub2 package is vulnerable to CVE-2020-14372, CVE-2020-25632, CVE-2020-25647, CVE-2020-27749, CVE-2020-27779, CVE-2021-20225, CVE-2021-20233 and CVE-2021-3418

[Léo Le Bouter]

As outlined by 
https://wiki.ubuntu.com/SecurityTeam/KnowledgeBase/GRUB2SecureBootBypass2021
we have a new wave of GRUB security vulnerabilities around SecureBoot.

There is no new upstream release so patching this appears to be some
kind of sport.

Debian has patched it in this commit: 
https://salsa.debian.org/grub-team/grub/-/commit/37c2a594625efba8b7f10d18a444393982d2e31f

I see also there's a new concept of SBAT section to ease administrative
efforts around certificate revocation when signed binaries such as some
GRUB2 things become vulnerable (and we don't want them to verify
successfully anymore).

This looks like a sizeable upgrade to a sensitive part of GNU Guix, so
we have to test carefully.

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