Make superglue's gemspec more conservative

[jho406]

I think making superglue’s gemspec a bit more conservative might make sense. Right now it uses.

  s.add_dependency "actionpack", ">= 7.0.0"
  s.add_development_dependency "activerecord", ">= 7.0"

Which says that it works with all future version of Rails. This isn’t 100% true as there’s a few monkey patches in `superglue_rails` that may not be compatible with future Rails versions.

We could

1. From the work to https://trello.com/c/SwB4ts3h/2-migrate-superglue-from-circleci-to-github test agains rails main weekly. Tho this is useful to do regardless of the change.
2. Be a bit more explicit and twiddle-wakka the versions.