main/postmarketos-mkinitfs: provide mkinitfs 3.6.0
linux-lts started requiring mkinitfs version 3.6.0 5 days ago as of writing, and this package only provides mkinitfs 0.0.1, so bump this to fix installation.
See https://gitlab.alpinelinux.org/alpine/aports/-/commit/f2ae372e8b25366af33550980fa9e0f98d0d2c75
That said, does our mkinitfs support compressed modules? Will this actually work? CC @craftyguy