Ensure Gitlab::JsonCache includes the GitLab version in the cache key
Source: https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/29885
What's more concerning was that 11.6 would read/write serialized ActiveRecord objects, while 11.7 would expect JSON strings. I think this might actually break 11.6, so that's why I'm wondering if we need to be including some version number with this cache key.