sysota: update to latest snapshot

This brings in initial support for working with GRUB.

The location has changed to Eclipse GitLab instance
with the GO_IMPORT of gitlab.com/zygoon/sysota. See the referenced
pull request for rationale on the latter part of this change.

Signed-off-by: Zygmunt Krynicki <zygmunt.krynicki@huawei.com>