main/grub: depend on mkinitfs

We need the initramfs to exists when grub trigger is executed so depend
on mkintfs so the mkinitfs trigger runs before grub trigger.

main/grub/APKBUILD

@@ -2,12 +2,12 @@
 # Maintainer: Timo Teräs <timo.teras@iki.fi>
 pkgname=grub
 pkgver=2.02
-pkgrel=10
+pkgrel=11
 pkgdesc="Bootloader with support for Linux, Multiboot and more"
 url="https://www.gnu.org/software/grub/"
 arch="all !s390x"
 license="GPL-3.0-or-later"
-depends=""
+depends="mkinitfs"
 triggers="grub.trigger=/boot"
 depends_dev=""
 makedepends="$depends_dev bison flex linux-headers xz-dev lvm2-dev