Bump GRUB revision to 8 November 2023 revision

Now the revision is:
64e3cee72ab8f5876abfebb263b5e6cf7c4a9a4e

The old revision was:
e58b870ff926415e23fc386af41ff81b2f588763

With this new revision update, the following patches have
been imported from the upstream GRUB project:

* 64e3cee72 gpt: Add compile time asserts for guid and gpt_partentry sizes
* 7de6fe963 types: Split aligned and packed guids
* 5fc985bfd gpt_partition: Mark grub_gpt_partentry as having natural alignment
* 7ad30299d efi: Deduplicate configuration table search function
* c6cf807fc lsefi: Add missing static qualifier
* a964e359b types: Fix typo
* 3f79e3b15 util/grub-mount: Check file path sanity
* 85e40b36e configure: Make the DJVU_FONT_SOURCE configurable with --with-dejavufont=FILE
* 2d6631d2a configure: Make the Unifont FONT_SOURCE configurable with --with-unifont=FILE
* 07318ee7e fs/xfs: Fix XFS directory extent parsing
* ad7fb8e2e fs/xfs: Incorrect short form directory data boundary check
* 4e10213de Revert "zfsinfo: Correct a check for error allocating memory"
* 4266fd2bb disk/i386/pc/biosdisk: Read up to 63 sectors in LBA mode
* cab04dcda kern/i386/pc/init: Flush cache only on VIA C3 and earlier
* 3c7e84257 fs/btrfs: Zero file data not backed by extents
* 4bcf6f747 kern/ieee1275/init: Restrict high memory in presence of fadump on ppc64
* cf58eca2a tests/util/grub-shell: Enable RNG device to better test stack smashing
* c3bdf263f kern/efi/init: Disable stack smashing protection on grub_efi_init()
* 95963d97f disk/cryptodisk: Add support for LUKS2 in (proc)/luks_script
* 016f14257 disk/cryptodisk: Optimize luks_script_get()
* f7a663c00 term/serial: Ensure proper NULL termination after grub_strncpy()
* a19e47ca4 commands/efi/lsefisystab: Print the UEFI specification revision in human readable form

Signed-off-by: Leah Rowe <leah@libreboot.org>

config/git/grub

@@ -1,5 +1,5 @@
 {grub}{
-	rev: e58b870ff926415e23fc386af41ff81b2f588763
+	rev: 64e3cee72ab8f5876abfebb263b5e6cf7c4a9a4e
 	loc: grub
 	url: git://git.savannah.gnu.org/grub.git
 	bkup_url: https://codeberg.org/libreboot/grub