[internal] Loosen activesupport constraint to support Rails 8 (FND-1038)

[mykhi]

What

Loosen the activesupport version constraint in comma.gemspec from < 6.1 to < 9, allowing the gem to be used with Rails 8.

Also includes:

• Use take(1).first instead of .first (avoids deprecated ordered first warning in Rails 8)
• Use to_fs for ActiveSupport::TimeWithZone values (Rails 8 deprecates to_s with format arguments)
• Bump version to 4.3.3

Why

Rails 8 ships with activesupport 8.x. The previous constraint < 6.1 (and later < 8 on the rails7 branch) prevented bundle resolution with Rails 8.

Acceptance Criteria

• comma.gemspec specifies activesupport >= 4.2.0, < 9
• bundle install resolves with rails ~> 8.0
• Existing CSV export specs pass

How to test?

1. Check out rails8 branch
2. Run bundle install with a Gemfile pinning rails ~> 8.0
3. Run the spec suite: bundle exec rspec

Notes/concerns

Branches for rails7 (rails7) and rails6.1 (rails61) are maintained separately for backward compatibility.

Checklist:

• Tests pass
• Version bumped (4.3.3)

[NiceMLT]

Some how I still get notifications for this repo. I wanted to say hi.