SW-6725: Allow Rails 7.x (raise gemspec rails ceiling to < 8.0)

[slad-cloudapp]

Why?

dropper_api is upgrading Rails 6.1 → 7.2.3.1 (SW-6714). This fork's gemspec caps the Rails dependency at <= 7.1, so bundler cannot resolve scim_rails against Rails 7.2 — a hard blocker for the upgrade.

What?

One-line change to scim_rails.gemspec:

- s.add_dependency "rails", ">= 6.0", "<= 7.1"
+ s.add_dependency "rails", ">= 6.0", "< 8.0"

Raises the ceiling to allow all of Rails 7.x. No functional/code changes to the gem — the SCIM controllers, config, and group functionality are untouched.

Caveats

• Widens the supported range to Rails 7.x; not yet validated against Rails 8 (kept < 8.0 intentionally).
• dropper_api currently pins to this branch (gem "scim_rails", github: "cloudapp/scim_rails", branch: "rails-7-2"). Once this merges to main, that PR will drop the branch: pin. Please do not delete the rails-7-2 branch until dropper_api's SW-6714 has merged and re-locked — the production bundle resolves against it in the meantime.

Testing Notes

• SCIM provisioning/deprovisioning is exercised via dropper_api's SCIM specs on the Rails 7.2 branch (SW-6714), which resolves against this branch and boots/tests cleanly.

Tracked by SW-6725.

[Copilot]

Pull request overview

Updates the scim_rails gem dependency constraints so it can be resolved alongside Rails 7.2.x (and generally all Rails 7.x) in downstream apps, unblocking the Rails 6.1 → 7.2 upgrade noted in the PR description.

Changes:

• Relax the Rails dependency upper bound from <= 7.1 to < 8.0 in the gemspec.

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