fix: revert: update grub to fix loading large initramfs

This reverts commit 70919d8.

Newer grub has issues with loading from XFS filesystems.
See siderolabs/talos#8023, and the fix in
`70919d82` cannot be backported to older version. So the safe option is
to revert while siderolabs/extensions#272
remains open.

Pkgfile

@@ -48,9 +48,9 @@ vars:
   gasket_driver_sha512: 1a8862610acb1246bcb7e86a9516bf3254f2b3a796dddbcc1666e31207bf629214172d049a9171343417442a02b76070bbaa802ee02128a7f9ab7f4a54a04676
 
   # renovate: datasource=git-tags extractVersion=^grub-(?<version>.*)$ depName=git://git.savannah.gnu.org/grub.git
-  grub_version: 2.12~rc1
-  grub_sha256: 7a60c08b0ff1bac630cae6293b73871a541610a7fb1a7337aeb5e96f359cd650
-  grub_sha512: 6f1fbce004b6dccf58e203bf6a6eeb771bac5ecc54b503265e56a97e9adce0221677bb3e64328144ec921f327a099f0345e7a9952be41cd8808f7635cded52cb
+  grub_version: 2.06
+  grub_sha256: b79ea44af91b93d17cd3fe80bdae6ed43770678a9a5ae192ccea803ebb657ee1
+  grub_sha512: 4f11c648f3078567e53fc0c74d5026fdc6da4be27d188975e79d9a4df817ade0fe5ad2ddd694238a07edc45adfa02943d83c57767dd51548102b375e529e8efe
 
   # renovate: datasource=github-releases extractVersion=^IPMITOOL_(?<version>.*)$ depName=ipmitool/ipmitool
   ipmitool_version: 1_8_19

grub/pkg.yaml

@@ -6,8 +6,7 @@ dependencies:
   - stage: util-linux
 steps:
   - sources:
-      #- url: https://ftp.gnu.org/gnu/grub/grub-{{ .grub_version }}.tar.xz
-      - url: https://launchpad.net/ubuntu/+archive/primary/+sourcefiles/grub2/2.12~rc1-12ubuntu2/grub2_{{ .grub_version }}.orig.tar.xz
+      - url: https://ftp.gnu.org/gnu/grub/grub-{{ .grub_version }}.tar.xz
         destination: grub.tar.xz
         sha256: "{{ .grub_sha256 }}"
         sha512: "{{ .grub_sha512 }}"
@@ -21,7 +20,7 @@ steps:
 
         PYTHON=python3 /toolchain/bin/bash ./autogen.sh
 
-        #patch -p1 < /pkg/patches/udev.patch
+        patch -p1 < /pkg/patches/udev.patch
         patch -p1 < /pkg/patches/efi-fat-serial-number.patch
 
     build: