Commit dfed5acb56 ("utils/check-package: use https for the manual URL")
replaced the default url to the Buildroot manual while it was used
by TestCheckPackage test.
Update TestCheckPackage with https url.
Fixes:
https://gitlab.com/buildroot.org/buildroot/-/jobs/6224243484
Cc: Yann E. MORIN <yann.morin.1998@free.fr>
Signed-off-by: Romain Naour <romain.naour@smile.fr>
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>
a9990552eb