gitclone: support git 2.38.1 when using submodules
See https://lore.kernel.org/lkml/xmqq4jw1uku5.fsf@gitster.g/
In the case of slapos, cloned repositories are considered trusted, so it should not be an issue to set this flag.
See https://lore.kernel.org/lkml/xmqq4jw1uku5.fsf@gitster.g/
In the case of slapos, cloned repositories are considered trusted, so it should not be an issue to set this flag.