boot/boot-wrapper-aarch64/Config.in: switch homepage URL to https
Buildroot commit [1] ("package: replace git:// URLs with https://
URLs where possible") switched _SITE URL from git to https, but did
not updated the package homepage in Config.in.
This commit updates it to match the package _SITE URL.
[1] https://gitlab.com/buildroot.org/buildroot/-/commit/6626bf7c5fc1f5f47fcade03090de212a6121db3
Signed-off-by: Julien Olivain <ju.o@free.fr>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>