chore(version): add configurations for rails {8.0, 8.1}, ruby 3.4

[adi-herwana-nus]

Summary

Brings the Coursemology fork up to Rails 8.0 / 8.1 support, aligned with our sister gems
(activerecord-userstamp, settings_on_rails), and fixes a latent #touch incompatibility. The
fork keeps its deliberate divergence from upstream (chaadow) — the custom non_cyclic_save
autosave — which is not changed here.

Full spec suite passes on AR 7.2 / 8.0 / 8.1 (95 examples, 0 failures each).

Changes

#touch(time:) fix (lib/active_record/acts_as/instance_methods.rb)

The override was def touch(*args) and dropped the Rails 6+ time: keyword. Rails' own deferred
touch flow (TouchLater#touch_deferred_attributes, run in before_committed! for
belongs_to … touch: true) calls touch(time:), so the override mis-read the {time: …} hash as a
column name and raised ActiveModel::MissingAttributeError. Now def touch(*args, time: nil),
forwarding time: to both the submodel and the supermodel — mirroring upstream.

Rails 8 test matrix

• Appraisals — replace rails-7.0 / rails-7.1 with rails-8.0 (~> 8.0.0) and
  rails-8.1 (~> 8.1.0); keep rails-7.2 (~> 7.2.0). Gemfiles regenerated.
• .github/workflows/ruby.yml — matrix is now ruby 3.1–3.4 × activerecord 7.2 / 8.0 / 8.1,
  excluding ruby 3.1 on Rails 8 (Rails 8 needs Ruby ≥ 3.2).

Gemspec (active_record-acts_as.gemspec)

• sqlite3 dev dependency ~> 1.7 → >= 2.1 (Rails 8 needs sqlite3 2.x).
• Removed the psych 3.3.2 pin — it conflicts with the psych bundled in modern Ruby and blocked the
  bundle on Ruby 3.3+.
• required_ruby_version >= 3.0 → >= 3.1; activesupport / activerecord >= 7.0 →
  >= 7.2 (drops the untested 7.0/7.1 line, matching the sister gems).
• Fixed the polymorphic typo and pointed homepage at the Coursemology fork.

Version

4.0.1 → 4.1.0 (minor: new Rails 8 support + touch fix, no breaking API change).

Deliberately NOT changed

Upstream (v5.x) replaced the custom Autosave / non_cyclic_save module with Rails-native
autosave: true associations. This fork's non_cyclic_save is an intentional Coursemology
divergence (f054dff, 234301b) and passes cleanly on Rails 8.1, so it is kept as-is. Adopting
upstream's refactor would revert that fix and is out of scope for this PR.

Verification

rails-7.2 → AR 7.2.3.2 → 95 examples, 0 failures
rails-8.0 → AR 8.0.5.1 → 95 examples, 0 failures
rails-8.1 → AR 8.1.3.1 → 95 examples, 0 failures

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Suggested commit message

feat: support Rails 8.0/8.1, fix #touch(time:) (v4.1.0)

- touch: accept the Rails 6+ `time:` kwarg and forward it to sub/supermodel,
  fixing ActiveModel::MissingAttributeError from the belongs_to(touch: true)
  deferred-touch flow; add a regression test
- appraisals/CI: test AR 7.2/8.0/8.1 on Ruby 3.1–3.4 (drop 7.0/7.1)
- gemspec: sqlite3 >= 2.1, activerecord/activesupport >= 7.2, ruby >= 3.1,
  drop the psych 3.3.2 pin
- bump version to 4.1.0

Keeps the fork's custom non_cyclic_save autosave (not upstream's refactor).